borings

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Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 6
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54579173933.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54579173933_51bf1411be_m.jpg" alt="" /></a><br />Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 6 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 10
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54579173883.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54579173883_6cae33d5bd_m.jpg" alt="" /></a><br />Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 10 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 11
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54579278095.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54579278095_0e01a34669_m.jpg" alt="" /></a><br />Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 11 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 9
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54579173748.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54579173748_f6ca98955f_m.jpg" alt="" /></a><br />Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 9 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 8
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54579125854.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54579125854_655eb08d6e_m.jpg" alt="" /></a><br />Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 8 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 7
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54579125719.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54579125719_4686037924_m.jpg" alt="" /></a><br />Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 7 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 5
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54579173523.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54579173523_85517a9e56_m.jpg" alt="" /></a><br />Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 5 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 4
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54579173378.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54579173378_6e3892f934_m.jpg" alt="" /></a><br />Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 4 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54578082527.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54578082527_ca7e6b0f6a_m.jpg" alt="" /></a><br />Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 1 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54579173348.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54579173348_b9f58a1ce3_m.jpg" alt="" /></a><br />Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 3 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54579173238.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54579173238_45a021e4a8_m.jpg" alt="" /></a><br />Petroxestes pera bivalve boring in a fossil bryozoan skeleton (Kope Formation, Upper Ordovician; Campbell County, Kentucky, USA) 2 / James St. John</span>

サイズ変更など

Woodpecker holes on a ponderosa pine (Florissant National Monument, Colorado, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54287094477.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54287094477_d3e723299d_m.jpg" alt="" /></a><br />Woodpecker holes on a ponderosa pine (Florissant National Monument, Colorado, USA) 2 / James St. John</span>

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Woodpecker holes on a ponderosa pine (Florissant National Monument, Colorado, USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54288214949.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54288214949_64101d7721_m.jpg" alt="" /></a><br />Woodpecker holes on a ponderosa pine (Florissant National Monument, Colorado, USA) 3 / James St. John</span>

サイズ変更など

Woodpecker holes on a ponderosa pine (Florissant National Monument, Colorado, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54287094462.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54287094462_45ed7153b1_m.jpg" alt="" /></a><br />Woodpecker holes on a ponderosa pine (Florissant National Monument, Colorado, USA) 1 / James St. John</span>

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Predatory boring in Melongena subcoronata (fossil snail shell) (Caloosahatchee Formation, Pliocene; LaBelle, Florida, USA)
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/54084715857.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/54084715857_afe5462f92_m.jpg" alt="" /></a><br />Predatory boring in Melongena subcoronata (fossil snail shell) (Caloosahatchee Formation, Pliocene; LaBelle, Florida, USA) / James St. John</span>

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Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 5
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/53848982944.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53848982944_c9246fe3e3_m.jpg" alt="" /></a><br />Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 5 / James St. John</span>

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Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 6
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/53848982794.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53848982794_90754b26dc_m.jpg" alt="" /></a><br />Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 6 / James St. John</span>

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Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 7
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/53848621706.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53848621706_b41605ea00_m.jpg" alt="" /></a><br />Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 7 / James St. John</span>

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Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 8
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/53848884388.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53848884388_bb9f7a5d1d_m.jpg" alt="" /></a><br />Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 8 / James St. John</span>

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Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 9
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/53849059835.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53849059835_43f9aa1eb4_m.jpg" alt="" /></a><br />Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 9 / James St. John</span>

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Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 10
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/53849059245.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53849059245_c24b08af13_m.jpg" alt="" /></a><br />Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 10 / James St. John</span>

サイズ変更など

Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/53849055385.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53849055385_64c7650ffb_m.jpg" alt="" /></a><br />Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 3 / James St. John</span>

サイズ変更など

Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/53848879173.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53848879173_c621cf0e73_m.jpg" alt="" /></a><br />Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 2 / James St. John</span>

サイズ変更など

Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/53848976084.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53848976084_9227c0c109_m.jpg" alt="" /></a><br />Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 1 / James St. John</span>

サイズ変更など

Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 4
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/53848975379.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53848975379_232e69b2f5_m.jpg" alt="" /></a><br />Strombus gigas (queen conch) with clionaid sponge borings (Grand Bahama Island, Bahamas) 4 / James St. John</span>

サイズ変更など

Dosinia discus (disc dosinia clam shell) (Sanibel Island, Florida, USA) 6
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/53434698889.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/53434698889_002decc004_m.jpg" alt="" /></a><br />Dosinia discus (disc dosinia clam shell) (Sanibel Island, Florida, USA) 6 / James St. John</span>

サイズ変更など

Grewingkia canadensis (fossil rugose coral encrusted with bryozoans) (Whitewater Formation, Upper Ordovician; Richmond South roadcut, Wayne County, Indiana, USA) 5
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52901745746.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52901745746_36b6324be3_m.jpg" alt="" /></a><br />Grewingkia canadensis (fossil rugose coral encrusted with bryozoans) (Whitewater Formation, Upper Ordovician; Richmond South roadcut, Wayne County, Indiana, USA) 5 / James St. John</span>

サイズ変更など

Grewingkia canadensis (fossil rugose coral encrusted with bryozoans) (Whitewater Formation, Upper Ordovician; Richmond South roadcut, Wayne County, Indiana, USA) 4
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52901907354.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52901907354_297c7ee684_m.jpg" alt="" /></a><br />Grewingkia canadensis (fossil rugose coral encrusted with bryozoans) (Whitewater Formation, Upper Ordovician; Richmond South roadcut, Wayne County, Indiana, USA) 4 / James St. John</span>

サイズ変更など

Grewingkia canadensis (fossil rugose coral encrusted with bryozoans) (Whitewater Formation, Upper Ordovician; Richmond South roadcut, Wayne County, Indiana, USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52901714836.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52901714836_b4e03ce6ed_m.jpg" alt="" /></a><br />Grewingkia canadensis (fossil rugose coral encrusted with bryozoans) (Whitewater Formation, Upper Ordovician; Richmond South roadcut, Wayne County, Indiana, USA) 3 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52376598365.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52376598365_4d0598e5ce_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 2 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52376177986.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52376177986_013946b539_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 1 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52375228292.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52375228292_2eed3fe053_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 3 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 4
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52375227732.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52375227732_4130719822_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 4 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 5
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52376175946.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52376175946_50f1929481_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 5 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 6
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52376488239.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52376488239_e20da5be32_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 6 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 7
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52376174476.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52376174476_2e1377cc77_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 7 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 8
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52376487029.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52376487029_1f58e2e8be_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 8 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 9
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52375224467.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52375224467_29c8231c0b_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 9 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 10
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52376485629.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52376485629_7faf5b2590_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 10 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 11
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52376484814.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52376484814_d4888f17c1_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 11 / James St. John</span>

サイズ変更など

Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 12
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52376589905.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52376589905_9e79f51440_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 12 / James St. John</span>

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Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 13
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52376170371.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52376170371_ce9c242275_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Flat Fork, Warren County, Ohio, USA) 13 / James St. John</span>

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Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Caesar Creek Lake's emergency spillway, Warren County, Ohio, USA) 40
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52373193121.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52373193121_dc978c7d71_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Caesar Creek Lake's emergency spillway, Warren County, Ohio, USA) 40 / James St. John</span>

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クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/52373610175.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/52373610175_5bcddd89f3_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Turkey Track Layer, Waynesville Formation, Upper Ordovician; Caesar Creek Lake's emergency spillway, Warren County, Ohio, USA) 41 / James St. John</span>

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Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51189669874.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51189669874_68c681c613_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 2 / James St. John</span>

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Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51189966515.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51189966515_4a50642e2e_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 3 / James St. John</span>

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Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 4
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51189966080.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51189966080_f927afaf6d_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 4 / James St. John</span>

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Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 5
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51189668654.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51189668654_71cc7c4c8d_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 5 / James St. John</span>

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Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 6
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51189668429.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51189668429_64e22b9c31_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 6 / James St. John</span>

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Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 7
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51189965165.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51189965165_53b57c885e_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 7 / James St. John</span>

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Petroxestes pera bivalve boring on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 8
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51188900026.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51188900026_89c18593d7_m.jpg" alt="" /></a><br />Petroxestes pera bivalve boring on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 8 / James St. John</span>

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Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/51189964825.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/51189964825_9e1c924aac_m.jpg" alt="" /></a><br />Petroxestes pera bivalve borings on limestone hardground (Upper Ordovician; Cincinnatian area, USA) 1 / James St. John</span>

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Borings in a Texigryphaea mucronata shell (Walnut Formation, Lower Cretaceous; Bell County, Texas, USA)
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50552878913.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50552878913_024d3a8f12_m.jpg" alt="" /></a><br />Borings in a Texigryphaea mucronata shell (Walnut Formation, Lower Cretaceous; Bell County, Texas, USA) / James St. John</span>

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Hystrivasum sp. (fossil snail shell) (Pliocene or Pleistocene; eastern USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50088754997.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50088754997_2b80f5d446_m.jpg" alt="" /></a><br />Hystrivasum sp. (fossil snail shell) (Pliocene or Pleistocene; eastern USA) 2 / James St. John</span>

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Hystrivasum sp. (fossil snail shell) (Pliocene or Pleistocene; eastern USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50088518861.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50088518861_65e4ae17e4_m.jpg" alt="" /></a><br />Hystrivasum sp. (fossil snail shell) (Pliocene or Pleistocene; eastern USA) 3 / James St. John</span>

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Hystrivasum sp. (fossil snail shell) (Pliocene or Pleistocene; eastern USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50087942318.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50087942318_02da0827a1_m.jpg" alt="" /></a><br />Hystrivasum sp. (fossil snail shell) (Pliocene or Pleistocene; eastern USA) 1 / James St. John</span>

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Paleocobble with Trypanites borings (Ordovician-Silurian boundary section, Route 41 roadcut at Ohio Brush Creek, Adams County, Ohio, USA) 2
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50024729126.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50024729126_853abdb71b_m.jpg" alt="" /></a><br />Paleocobble with Trypanites borings (Ordovician-Silurian boundary section, Route 41 roadcut at Ohio Brush Creek, Adams County, Ohio, USA) 2 / James St. John</span>

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Paleocobble with Trypanites borings (Ordovician-Silurian boundary section, Route 41 roadcut at Ohio Brush Creek, Adams County, Ohio, USA) 3
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50024186418.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50024186418_2c9f30f36f_m.jpg" alt="" /></a><br />Paleocobble with Trypanites borings (Ordovician-Silurian boundary section, Route 41 roadcut at Ohio Brush Creek, Adams County, Ohio, USA) 3 / James St. John</span>

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Paleocobble with Trypanites borings (Ordovician-Silurian boundary section, Route 41 roadcut at Ohio Brush Creek, Adams County, Ohio, USA) 1
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/50024185883.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/50024185883_f0c9a78cf3_m.jpg" alt="" /></a><br />Paleocobble with Trypanites borings (Ordovician-Silurian boundary section, Route 41 roadcut at Ohio Brush Creek, Adams County, Ohio, USA) 1 / James St. John</span>

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Ropalonaria venosa (ctenostome bryozoan borings) (Upper Ordovician; Brookville Causeway roadcut, Franklin County, Indiana, USA)
by James St. John

クリエイティブ・コモンズ表示 2.1

<span style="font-size:10px;"><a href="http://www.igosso.net/flk/49999557017.html" target="_blank"><img src="http://farm66.static.flickr.com/65535/49999557017_acc910edf0_m.jpg" alt="" /></a><br />Ropalonaria venosa (ctenostome bryozoan borings) (Upper Ordovician; Brookville Causeway roadcut, Franklin County, Indiana, USA) / James St. John</span>

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