After a thorough search for all fields and wildcat wells where heaving shale has been recorded in the Texas Coastal Plain, it has been found that there are five principal heaving-shale zones: Lower Miocene, Middle Oligocene, Vicksburg, Jackson, and Yegua. These formations form belts or trends parallel with the shore line of the Gulf of Mexico. The downdip limit of each trend can not be determined as accurately as the updip limit because of the less advanced drilling practices in the past, and because sufficient deep wells drilled downdip are lacking. A map showing the several trends is helpful in determining the probability of encountering heaving shale. A comprehensive bibliography is included.

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