Dakota Sandstone (Lower Cretaceous) (Dinosaur Ridge, Colorado, USA) 32 : 無料・フリー素材/写真
Dakota Sandstone (Lower Cretaceous) (Dinosaur Ridge, Colorado, USA) 32 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Structurally-tilted sandstones in the Cretaceous of Colorado, USA.This outcrop is part of Dinosaur Ridge (a section of the Dakota Hogback), which is a north-south trending ridge of eastward-dipping Mesozoic sedimentary rocks. Triassic, Jurassic, and Cretaceous rocks are present, tilted by Laramide Orogeny uplift during the Cenozoic (the Front Range of the Colorado Rocky Mountains is immediately west of here).The exposure consists of structurally tilted beds of the Dakota Sandstone, a Lower Cretaceous succession of nearshore terrestrial to intertidal to shallow marine quartz sandstone deposits. Darker-colored interbeds are composed of finer-grained siliciclastics.Stratigraphy: Dakota Sandstone, Albian Stage, upper Lower CretaceousLocality: crest of Dinosaur Ridge, between Interstate 70 and the town of Morrison, west of Denver, north-central Colorado, USA |
| 撮影日 | 2009-06-15 15:32:17 |
| 撮影者 | James St. John |
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