Quaternary geology of the Gulf of Mexico Coastal Plain
Published:January 01, 1991
Jules R. DuBar, Thomas E. Ewing, Ernest L. Lundelius, Jr., Ervin G. Otvos, Charles D. Winker, 1991. "Quaternary geology of the Gulf of Mexico Coastal Plain", Quaternary Nonglacial Geology, Roger B. Morrison
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This chapter divides the Gulf Coastal Plain province into three major sectors: (1) the area west of the Mississippi embayment where sequences are fine-grained fluvial-deltaic and marginal marine facies; (2) the area east of the Mississippi embayment to peninsular Florida where sequences are chiefly fine-grained clastic fluvial, with relatively minor deltaic and marginal marine facies; and (3) peninsular Florida where sequences typically are brackish-water and nearshore-marine sand and calcareous facies. Also discussed are coastal plain tectonics and Quaternary vertebrate fossil localities. The Mississippi embayment is discussed elsewhere in this volume (Chapter 17, Autin and others).
The Gulf of Mexico Coastal Plain of the United States extends from the Mexican border to the southern tip of Florida, a distance of about 2,350 km. The Pleistocene of the Gulf Coastal Plain is bounded inland by Neogene exposures, and seaward near the present coast by a narrow strip of Holocene sediments. Width of the Pleistocene plain varies from 60 to 140 km west of the Mississippi embayment, to 30 to 130 km east of the embayment. The entire Florida peninsula, with the possible exception of parts of the central highlands, is covered by a veneer of Pleistocene sediments. Surfaces of the Gulf Coastal Plain underlain by Pleistocene sediments are characterized by little relief and by seaward gradients of 0.2 to 3.0 m/km.
Near the present coast of Texas and western Louisiana, thickness of the Pleistocene section ranges from about 240 to 460 m, whereas under the northeastern segment of the Gulf Coastal Plain
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Quaternary Nonglacial Geology
Includes 5 topical chapters covering paleoclimates, dating methods, volcanism, tephrochronology, and Pacific margin tephrochronologic correlation, and 15 chapters of regional synthesis covering: the Pacific margin; the Columbia Plateau; the Snake River Plain; the major pluvial lakes of the Great Basin; the Basin and Range in California, Arizona, and New Mexico; the Colorado Plateau; the Southern and Central Rocky Mountains; the Northern and Southern Great Plains, Osage Plains, and Interior Highlands; the Lower Mississippi Valley; the Gulf of Mexico Coastal Plain and Florida; the Appalachian Highlands and Interior Low Plateaus; and the Atlantic Coastal Plain. A large, full-color geologic map of the Quaternary deposits of the Lower Mississippi Valley, in addition to correlation charts, tables, and cross-sections relating to other chapters, is also included.