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Dakota Sandstone (Lower Cretaceous) (Dinosaur Ridge, Colorado, USA) 2 : 無料・フリー素材/写真

Dakota Sandstone (Lower Cretaceous) (Dinosaur Ridge, Colorado, USA) 2 / James St. John
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Dakota Sandstone (Lower Cretaceous) (Dinosaur Ridge, Colorado, USA) 2

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ライセンスクリエイティブ・コモンズ 表示 2.1
説明Structurally tilted Dakota Sandstone in the Cretaceous of Colorado, USA.The outcrop shown above 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).This exposure consists of the Dakota Sandstone, a Lower Cretaceous succession of nearshore terrestrial to intertidal to shallow marine quartz sandstone deposits. Dinosaur tracks are common on some Dakota Sandstone bedding planes in this area. A shallow channelform (probably a tidal channel) is present on the left side of the photo.Stratigraphy: Dakota Sandstone, Albian Stage, upper Lower CretaceousLocality: Dinosaur Ridge, between Interstate 70 and the town of Morrison, west of Denver, north-central Colorado, USA
撮影日2012-12-16 13:56:38
撮影者James St. John
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