The lead and zinc deposits in the Upper Cambrian rocks of central Texas are reviewed in the light of new detailed information. Included are analytical data for all deposits, detailed stratigraphic sections of the Cambrian rocks, and maps at a scale of 4 inches to the mile. Igneous rocks of Carboniferous or younger age in the area are recognized for the first time.

Uranium minerals have been found at several localities in west Texas. In the King Mountain area in southwestern Upton County carnotite forms coatings along joint planes and in borings in marineCretaceous limestone. In the Hueco Mountains area in El Paso and Hudspeth counties carnotite and similar secondary uranium minerals form coatings in caliche and colluvium of Pleistocene ( ? ) or Recent age, and along joints and bedding planes in limestone of Permian age. No uranium ore has been produced, however, from either area.

Rocks exposed in the Cathedral Mountain quadrangle in the southeastern DavisMountains of Trans-Pecos Texas are assigned to the Word formation and to Capitan limestone in the Permian Guadalupe series; to the Maxon sandstone, Edwards limestone, Georgetown limestone, and Grayson (Del Rio) marl in the Cretaceous Comanche series; to the Buda limestone and Boquillas limestone in the Cretaceous Gulf series; and to the Buck Hill volcanic series in the Tertiary. Volcanic rocks up to 4600 feet thick cover most of the quadrangle.