The ecology of the Apalachicola The ecology of the Apalachicola Bay system : an estuarine profile ecologyofapalach00livi Year: [1984] plains of late Holocene oriqin (Fernald 1Q81). The linear, qentlv curving beach ridges of the area attest to the changes in orientation of the estuary through geological time in resoonse to wide fluctuations of sea level. The Apalachicola estuary is part of a broad, sandv shore plain, which is constantly being changed by a combination of climatological elements such as wind, rainfall and sea level alterations. The present structure of the bay is around 10,000 y
The ecology of the Apalachicola The ecology of the Apalachicola Bay system : an estuarine profile ecologyofapalach00livi Year: [1984] plains of late Holocene oriqin (Fernald 1Q81). The linear, qentlv curving beach ridges of the area attest to the changes in orientation of the estuary through geological time in resoonse to wide fluctuations of sea level. The Apalachicola estuary is part of a broad, sandv shore plain, which is constantly being changed by a combination of climatological elements such as wind, rainfall and sea level alterations. The present structure of the bay is around 10,000 years old (Tanner 1^83). Sea level reached its modern position about SOOO years ago when the construction of the present barrier island chain was underway. Exceot for the southward migration of the delta front, the general outline of the bay system was established at this time (Tanner 1^83). ?.!.?. Oeomorphology and Regional Geology a. Upland areas. The maior formations in the upper Chattahoochee River system are underlain by igneous rocks and crystalline schists. The area is characterized by Tertiarv limestone outcroppinqs, which add to the habitat diversity of the region (Figure 6). The lower division of Piedmont upland, defined as the Opelika Plateau, is underlain by Archean (, Precambrian) rocks. Tributaries of the Ohattahoochee River have subsequently eroded these formations with some valleys cut approximately 6? m (?00 ft) below the general surface. The rocks of the Appalachian province pass under the Coastal Plain formations. Along the border between the Appalachian province and the Coastal Plain, Appalachian rocks are overlain by Cretaceous formations, more deeply buried Quaternary sediments further north Coastal Plain is covered with a These rocks by Tertiary are and The thick layer of clastic (erosion produced) sediments as well as limestone (nonclastic) sediments, some of which mav be crystalline. Adams et al. (1'526) have presented a detailed account of the Paleo
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