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Studies of the outcrop areas of igneous intrusions in the Texas, Arkansas, and Georgia portions of the Gulf Coastal Plain furnish clues which simplify interpretation of igneous rocks found in deep well samples in the Mississippi Embayment. Many of the known centers of later Mesozoic igneous activity, both outcropping and buried, are apparently the sites of ancient volcanoes which furnished to the depositional basins significant amounts of pyroclastic debris now in part preserved in the early and middle Gulf Cretaceous strata. Dikes transect the older sedimentary rocks in the vicinity of the eruptive centers. The earliest igneous rocks of the northern Coastal Plain may bear a Triassic date; the latest were emplaced in late Austin or early Taylor time.
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