Cenozoic rocks are widespread in Texas but occur primarily in a broad
belt along the Gulf Coastal Plain. In addition, there are exposures of
nonmarine Cenozoic strata in the High Plains, North-Central Plains, and
Trans-Pecos region. There are also many exposures of Cenozoic igneous
rocks in Trans-Pecos Texas.
Rocks of Cenozoic age occur in more than one-third of Texas and consist
of conglomerates, sands, clays, and some limestone and lignite beds.