Fountain Formation (Pennsylvanian to Permian; Manitou Springs, Colorado, USA) 36 : 無料・フリー素材/写真
Fountain Formation (Pennsylvanian to Permian; Manitou Springs, Colorado, USA) 36 / 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 | The Fountain Formation is a significant stratigraphic unit in the Upper Paleozoic of Colorado. It is about 900 meters thick at its greatest and consists of reddish-colored siliciclastics of Pennsylvanian to Permian age. The sediments were eroded from the Ancestral Rocky Mountains and deposited in ancient, terrestrial alluvial fans to nearshore marine fan deltas.The outcrop seen here is in the type area for the Fountain Formation - exposures adjacent to Fountain Creek in the town of Manitou Springs, central Colorado. In general, the unit is composed of mixed siliciclastics, from shale to siltstone to sandstone to conglomerate. At this site, it includes arkosic quartzose sandstones, pebbly sandstones, and granulose sandstones. The rocks are muscovitic in part. The original source rocks were obviously rich in quartz and potassium feldspar - in other words, granites. The reddish coloration is from iron oxide (hematite, Fe2O3).Stratigraphy: Fountain Formation, Pennsylvanian to PermianLocality: roadcut along the northern side of Route 24, northern side of the town of Manitou Springs, west of Colorado Springs, western El Paso County, central Colorado, USA (38° 51’ 43.53” North latitude, 104° 54’ 50.13” West longitude)--------------------------------Some info. from:Noblett et al. (1987) - The Garden of the Gods and basal Phanerozoic nonconformity in and near Colorado Springs, Colorado. Geological Society of American Centennial Field Guide, Rocky Mountain Section: 335-338. |
| 撮影日 | 2010-10-29 11:41:30 |
| 撮影者 | James St. John |
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