Shinarump Conglomerate over De Chelly Sandstone (Upper Triassic over Lower Permian; Canyon de Chelly, Arizona, USA) 17 : 無料・フリー素材/写真
Shinarump Conglomerate over De Chelly Sandstone (Upper Triassic over Lower Permian; Canyon de Chelly, Arizona, USA) 17 / 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 | Conglomerate & sandstone in the Permo-Triassic of Arizona, USA.This outcrop is in Arizona's Canyon de Chelly National Monument. The darker-colored rocks at upper right & at left are part of the Upper Triassic Shinarump Conglomerate. The underlying reddish colored rocks are part of an ancient sand dune deposit called the De Chelly Sandstone (pronounced "De Shay") (Lower Permian). The Shinarump-De Chelly contact is an unconformity. Unconformities are erosion surfaces representing missing time. Bedding geometries in the two units are parallel, making the erosion surface a disconformity. The De Chelly Sandstone here has many tilted layers - those are cross-beds, which formed in a one-directional wind current. However, the horizontal bedding in the De Chelly is parallel with bedding in the overlying Shinarump.Stratigraphy: Shinarump Conglomerate Member, lower Chinle Formation, Norian Stage, Upper Triassic disconformably overlying De Chelly Sandstone, Leonardian Stage, Lower PermianLocality: view from Tunnel overlook, southern rim of Canyon de Chelly, Canyon de Chelly National Monument, northeastern Arizona, USA |
| 撮影日 | 2007-09-03 16:50:09 |
| 撮影者 | James St. John |
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