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Upper middle Jurassic (Callovian?) Louann salt is presently found overlying continental, transitional, and ocean crust. Overlying continental crust, extensive salt deposits are found in central and northern Louisiana and southern Arkansas. The basins containing them include the Mississippi Interior, East Texas and North Louisiana basins, the Tampa Embayment, and the more regional Gulf Coast Geosyncline. Along the latter, salt is found west of the Santa Rosa Arch, 86°W, and generally east of the San Marcos Arch, 97°W, and locally within the Rio Grande Embayment. These salts appear to be autocraneous.

Overlying transitional crust are the extensive salt deposits generally in the Louisiana offshore, with some salt in the eastern Texas offshore to approximately 96°W, and in the Alabama offshore to approximately 87°W. This salt may be autocraneous, or it was laterally extruded southward from the north (Humphris, 1978; Jackson and Cramez, 1989)”.

Overlying oceanic crust, salt extends from approximately 87°W to 96°W. The southern boundary is the bathymetrically significant Sigsbee Escarpment. The northern boundary is transitional, with salt overlying transitional crust. This salt is generally held to have been extruded from the north. (See Humphris, 1978; Jackson, et al., 1988, among others). Mention is made by Lopez (1989) of a stock-like feature underlying this salt extruded wedge near 27°N, 90°20'W. This feature, confirmed by seismic data, may be an isolated salt dome rising to the extruded salt wedge. Also, this dome may have been derived from normal seafloor spreading processes.

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