1. Structural cross sections, Miocene series, Texas continental shelf [cartographic material] Yale Public content 1985. 2018-04-20T19:43:40Z. 2018-09-05T19:36:07Z. Morton, Robert A. Bureau of Economic Geology, University of Texas at Austin. English. cartographic image. Public. Texas, Gulf Region, and Gulf Region. Miocene and From 10 to 25 million years ago.