Goliad Formation

The Goliad Formation (Tg) is a geologic formation in Texas. It preserves fossils dating back to the Serravallian to earliest Pliocene stages (Clarendonian, Hemphillian and earliest Blancan in the NALMA classification) of the Neogene period, including the gomphothere Blancotherium among many other fossil mammals, reptiles, birds and fish.

The formation hosts uranium deposits and forms the Evangeline aquifer underneath the city of Houston.

Description

The Goliad Formation was described by Plummer in 1933, as consisting of three members; the Lapara Sand, overlain by the Lagarto Creek Beds, in turn overlain by the Labahia Beds with outcrop thicknesses ranging from 35 to 200 feet (11 to 61 m). The Goliad Formation comprises claystone, sand, sandstone, marl, caliche, limestone, and conglomerates and reaches in certain areas a thickness of 180 metres (590 ft). The formation overlies the Fleming Formation and dates from the Clarendonian to the earliest Blancan. In the southwest of its range, the formation overlies the Catahoula and Gueydan Formations. The Goliad Formation is recognized regionally across the Texas coastal plain as an interval of dominantly fluvial siliciclastic strata that overlies the Miocene Fleming Formation and underlies Pleistocene terrace deposits. The formation is now interpreted as a basinward-thickening progradational wedge of Middle and Late Miocene age. Stratigraphic thicknesses in outcrop range from 60 to 120 metres (200 to 390 ft), but offshore the interval thickens to as much as 365 to 425 metres (1,198 to 1,394 ft).

Together with the Catahoula, Fleming and Oakville Formation, the Goliad Formation is part of the Gulf Coast aquifer, an extensive artesian aquifer that produces water primarily for irrigation and municipalities. The Evangeline aquifer is hosted by the Goliad Formation underlying the city of Houston. The formation hosts uranium deposits in the South Texas Uranium Province and is mined for caliche in Hidalgo County, Texas.

Fossil content

Tertiary mammal fossils from South Texas were first reported by Dumble (1894) as coming from the Lapara division, later the Lapara Beds (Dumble, 1903).

The following fossils have been reported from the formation:

See also

• List of fossiliferous stratigraphic units in Texas
• Paleontology in Texas

Bibliography

Geology

• Campbell, Michael D.; Campbell, M. David; Wise, Henry M. (2018), "Growth Faulting and Subsidence in the Houston, Texas Area: Guide to the Origins, Relationships, Hazards, Potential Impacts and Methods of Investigation: An Update", Journal of Geology and Geoscience, 2: 1–51
• Nicot, Jean-Philippe; Scanlon, Bridget R.; Yang, Changbing; Gates, John B. (2010), Geological and Geographical Attributes of the South Texas Uranium Province, Bureau of Economic Geology, pp. 1–156
• Baskin, Jon; Hulbert, Richard C. (2008), , Gulf Coast Association of Geological Societies, 58: 93–101
• Page, William R.; VanSistine, D. Paco; Turner, Kenzie J. (2005), (PDF), USGS, pp. 1–11

Paleontology

• May, S.R (2019), , Palaeontologia Electronica, 22.1.15: 1–129
• Baskin, Jon; Hulbert, Richard C. (2012), , Paludicola, 8: 187–193
• Webb, S.D (2008), "Revision of the extinct Pseudoceratinae (Artiodactyla: Ruminantia: Gelocidae)", Bulletin of the Florida Museum of Natural History, 48 (2): 17–58, doi:, S2CID
• Prothero, D.R (2005), The Evolution of North American Rhinoceroses, Cambridge University Press, pp. 1–218, ISBN 9781108457200
• Alroy, J (2002), Synonymies and reidentifications of North American fossil mammals, .

Further reading

• Weeks, A. W., 1945, Oakville, Cuero, and Goliad formations of Texas Coastal Plain between Brazos River and Rio Grande: American Association of Petroleum Geologists Bulletin, v. 29, p. 1721–1732
• E. H. Sellards. 1941. Final report covering the period from March 4, 1939, to September 30, 1941, for the state-wide paleontologic-mineralogic survey in Texas. A Federal Works Agency Work Projects Administration Project iii-85
• Anonymous. 1941. The ninth quarterly report covering the quarter ending June 30, 1941 for the state-wide paleontologic-mineralogic survey in Texas. A Federal Works Agency Work Projects Administration Project. O.P. No. 665-66-3-233. State Serial No. 300-88 1-41
• Anonymous. 1940. The seventh quarterly report covering the quarter ending December 31, 1940 for the state-wide paleontologic-mineralogic survey in Texas. A Federal Works Agency Work Projects Administration Project. O.P. No. 665-66-3-233. State Serial No. 300-88 1-44
• Anonymous. 1940. The sixth quarterly report covering the quarter ending September 30, 1940 for the state-wide paleontologic-mineralogic survey in Texas. A Federal Works Agency Work Projects Administration Project. O.P. No. 665-66-3-233. State Serial No. 300-88 1-44
• Anonymous. 1939. The second quarterly report covering the quarter ending September 30, 1939 for the state-wide paleontologic-mineralogic survey in Texas. A Federal Works Agency Work Projects Administration Project. O.P. No. 665-66-3-233. State Serial No. 300-88 1-26
• Anonymous. 1939. The first quarterly report covering the quarter ending June 30, 1939 for the state-wide paleontologic-mineralogic survey in Texas. A Federal Works Agency Work Projects Administration Project. O.P. No. 665-66-3-233. State Serial No. 300-88 1-22+