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Abstract

This seismic section is located on the Atlantic continental shelf about 60 mi (96.5 km) from the Georgia coast. The line crosses a half-graben containing steeply-dipping rocks sub-cropping at, and truncated by, a regional unconformity. The half-graben probably formed during the early Mesozoic rifting cycle which preceded the separation of the North America and Africa plates. The oldest rocks overlying the unconformity at this location are early Early Cretaceous in age. The dipping section beneath the unconformity is inferred to be composed of Triassic or Paleozoic clastics. Onshore wells in northern Florida and southern Georgia have drilled unmetamorphosed lower Paleozoic sandstone and shale beneath the lower Mesozoic Unconformity. These sediments have a greater lithologic and paleontologic similarity to lower Paleozoic rocks in Senegal, West Africa, than to the age-equivalent section on the west side of the Appalachians. Most pre-drift restorations of Africa and North America show Senegal and the southeastern United States more or less in juxtaposition.

Lippert, R.H., 1983, The "Great Stone Dome" - a compaction structure, in A.W. Bally, ed., Seismic expressions of structural styles, vol. 1: AAPG Studies in Geology Series No. 15, v. 1, p. 1.3-1 - 1.3-4.

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