| Abstract: | Profound cooling of Miocene marine climates in southern Alaska culminated in early middle Miocene coastal marine glaciation in the northeastern Gulf of Alaska. This climatic change resulted from interaction of the Yakutat terrane with southern Alaska beginning in late Oligocene time. The ensuing extreme uplift of the coastal Chugach and St. Elias Mountains resulted in progressive regional cooling that culminated in coastal marine glaciation beginning in the early middle Miocene (15-16 Ma) and continuing to the present. The counterclockwise flow of surface water from the frigid northeastern Gulf of Alaska resulted in a cold-temperate shallow-marine environment in the western Gulf of Alaska, as it does today. Ironically, dating of Gulf of Alaska marine glaciation as early middle Miocene is strongly reinforced by the presence of a few tropical and subtropical mollusks in western Gulf of Alaska faunas. Shallow-marine waters throughout the Gulf of Alaska were cold-temperate to cold in the early middle Miocene, when the world ocean was undergoing peak Neogene warming. -Author |
| Genre: | Article |
| ProdID: | 70015867 |
| Citation Author: | Marincovich, Jr, L. |
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| Citation End Page: | 1599 |
| Citation Issue: | 11 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geological Society of America Bulletin |
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| Citation Number Of Pages: | 9 |
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| Citation Search Results Text: | Molluscan evidence for early middle Miocene marine glaciation in southern Alaska; 1990; Article; Journal; Geological Society of America Bulletin; Marincovich, Jr, L. |
| Citation Start Page: | 1591 |
| Citation Volume: | 102 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Molluscan evidence for early middle Miocene marine glaciation in southern Alaska; 1990; Article; Journal; Geological Society of America Bulletin; Marincovich, Jr, L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1990 00:00 -0600 |
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