Locality information


Stratigraphic Column


Map of locality in Texas.


Generalised Stratigraphic Section (not to scale).

The wide-ranging Catahoula Formation is exposed in several places, mostly Texas and Lousiana. Dr. Crepet's site was exposed at a former rock quarry near Huntsville, in Walker County, Texas. The site is presently flooded and is used for scuba diving. The locality is no longer open for collectiong without special permission. Dr. Crepet had collected several times before the site's closure and subsequent flooding. Dr. Crepet also has access to collections from other Universities from the same locality.


The formation is part of the Houston Embayment. The stratigraphic position of the studied material is the lower portion of the Catahoula Formation. The sediments consist of highly siliceous clays and silts. The formation is thought to be associated with a fluvial/crevasse-splay depositional environment.

The paleoenvironment, reconstructed from the fossil flora and depositional profiles, was warm temperate to cool subtropical. These sediments have been dated by stratigraphic means as Oligocene in age.

Please see these references for further information:

Daghlian, C. P., W. L. Crepet, and T. Delevoryas, 1980. Investigations of Tertiary Angiosperms: A New Flora Including Eomimosoidea plumosa from the Oligocene of Eastern Texas. American Journal of Botany 67 (3): 309-320.

Galloway, W. E. 1977. Catahoula Formation of the Texas Costal Plain: depositional, systems, composition, structural development, ground-water flow, history, and Zuranium distribution. University of Texas Bureau of Economic Geology Report. Invest. 87.

Wilson, J. A. , 1957. 8: Early miocene Entelodonts, Texas Coastal Plain. American Journal of Science, 255: 641-649.