Fossil leaves (Laramie Formation; Upper Cretaceous; Parfet Prehistoric Preserve, Golden, Colorado, USA) 3 : 無料・フリー素材/写真
Fossil leaves (Laramie Formation; Upper Cretaceous; Parfet Prehistoric Preserve, Golden, Colorado, USA) 3 / 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 | Fossil leaves in sandstone in the Cretaceous of Colorado, USA.Seen here are fossil leaves exposed on the underside of a tectonically-tilted sandstone bed in Golden, Colorado. This is an old clay mine - soft clay horizons occurred between hard sandstone intervals of the Laramie Formation. The beds here are vertically oriented - structural tilting occurred during the Laramide Orogeny in the Tertiary. The Laramie Formation is a nonmarine, coastal plain to deltaic succession of mostly mixed siliciclastic sedimentary rocks - sandstones, siltstones, claystones, and coals.After clay mining ceased, the site became a landfill for ash from coal burning operations. Landfill activity buried many dinosaur footprints preserved in the Laramie Formation sandstones. The locality is now a "fossil preserve" with dinosaur footprints, plant fossils, and other features that can be closely examined along trails. An odd-looking golf course makes up the rest of the old clay mine.Stratigraphy: Laramie Formation, Maastrichtian Stage, upper Upper CretaceousLocality: outcrop along Triceratops Trail, Parfet Prehistoric Preserve, southern side of the town of Golden, Colorado, USA (vicinity of 39° 44' 36.39" North latitude, 105° 13’ 10.37" West longitude) |
| 撮影日 | 2007-07-25 16:09:08 |
| 撮影者 | James St. John |
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