Caririchnium leonardii dinosaur tracks (Dakota Sandstone, Lower Cretaceous; Dinosaur Ridge, Colorado, USA) 2 : 無料・フリー素材/写真
Caririchnium leonardii dinosaur tracks (Dakota Sandstone, Lower Cretaceous; Dinosaur Ridge, Colorado, USA) 2 / 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 | Caririchnium leonardii dinosaur tracks on quartzose sandstone, Cretaceous of Colorado, USA.This sandstone bedding plane at Dinosaur Ridge, Colorado has numerous dinosaur footprints. The most common track type is this - Caririchnium leonardii, which is the trace fossil name. It was made by an iguanodontid dinosaur. The large, wide, three-toed print was produced by a hindfoot. The small hole above it was made by a forefoot.The dark coloration in the tracks is not natural - they have been stained with charcoal to make them easier to see (the charcoal does not damage the tracks).Stratigraphy: Dakota Sandstone, upper Lower CretaceousLocality: eastern side of Dinosaur Ridge, Dakota Hogback, west of Denver, north-central Colorado, USA-------------Trace fossils are any indirect evidence of ancient life. They refer to features in rocks that do not represent parts of the body of a once-living organism. Traces include footprints, tracks, trails, burrows, borings, and bitemarks. Body fossils provide information about the morphology of ancient organisms, while trace fossils provide information about the behavior of ancient life forms. Interpreting trace fossils and determination of the identity of a trace maker can be straightforward (for example, a dinosaur footprint represents walking behavior) or not. Sediments that have trace fossils are said to be bioturbated. Burrowed textures in sedimentary rocks are referred to as bioturbation. Trace fossils have scientific names assigned to them, in the same style & manner as living organisms or body fossils. |
| 撮影日 | 2015-07-16 13:49:58 |
| 撮影者 | James St. John |
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