Morrison Formation (Upper Jurassic; Dinosaur Ridge, west of Denver, Colorado, USA) 25 : 無料・フリー素材/写真
Morrison Formation (Upper Jurassic; Dinosaur Ridge, west of Denver, Colorado, USA) 25 / 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 | Shales and sandstones in the Jurassic of Colorado, USA.Dinosaur Ridge is a particularly dinosaur fossil-rich section of the Dakota Hogback in north-central Colorado. It is a north-south trending ridge of eastward-dipping Mesozoic sedimentary rocks. Seen here is the western side of Dinosaur Ridge, with exposures of the Morrison Formation, an Upper Jurassic succession consisting of fluvial (river/floodplain) and lacustrine (lake) deposits, plus reddish-colored paleosol horizons. Dinosaur bones and dinosaur tracks have been found here.Stratigraphy: Morrison Formation, Kimmeridgian Stage, middle Upper Jurassic, ~150 to 156 MaLocality: western side of Dinosaur Ridge, near "Quarry 5" (= one of Arthur Lakes' dinosaur excavation sites during the Cope-Marsh Bone Wars of the late 1800s), between Interstate 70 and the town of Morrison, west of Denver, Colorado, USA |
| 撮影日 | 2010-11-03 13:17:18 |
| 撮影者 | James St. John |
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