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Summary
Figure 35A. The first invasions of the Paleozoic sea. In Early Cambrian time an arm of the Pacific Ocean occupied a deep trough in Idaho, Nevada, and part of Utah. The land to the east was a broad gently rolling plain of Precambrian rocks drained by sluggish westward-flowing streams. The site of the Teton Range was part of this plain. Slow subsidence of the land caused the sea to move eastward during Middle Cambrian time flooding the Precambrian plain.
Figure 35B. By Late Cambrian time the sea had drowned all of Montana and most of Wyoming. The Flathead Sandstone and Gros Ventre Formation were deposited as the sea advanced. The Gallatin Limestone was being deposited when the shoreline was in about the position shown in this drawing.
Figure 35C. In Early Ordivician time uplift of the land caused the sea to retreat back into the trough, exposing the Cambrian deposits to erosion. Cambrian deposits were partly stripped off of some areas. The Bighorn Dolomite was deposited during the next advance of the sea in Middle and Late Ordovician time.
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Source
http://www.nps.gov/history/history/online_books/grte/grte_geology/sec6.htm
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| Date/Time | Thumbnail | Dimensions | User | Comment |
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| current | 07:48, 1 December 2008 |  | 450 × 721 (24 KB) | TaeWoong | Figure 35A. The first invasions of the Paleozoic sea. In Early Cambrian time an arm of the Pacific Ocean occupied a deep trough in Idaho, Nevada, and part of Utah. The land to the east was a broad gently rolling plain of Precambrian rocks drained by slugg |
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