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Waxahachie, Ellis Co., Texas, USA

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Latitude & Longitude (WGS84): 32° 23' 11'' North , 96° 50' 53'' West
Latitude & Longitude (decimal): 32.38653,-96.84833
Köppen climate type:Cfa : Humid subtropical climate

3 miles northwest of town

Mineral List

1 valid mineral.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Late Cretaceous
66 - 100.5 Ma

ID: 2893997
Austin Chalk

Age: Late Cretaceous (66 - 100.5 Ma)

Stratigraphic Name: Austin Chalk

Comments: In Eastern part of Trans-Pecos Texas and High Plains- Chalk and marl; chalk mostly microgranular calcite with minor foraminifera tests and Inoceramun prisms, averages ab out 85 percent calcium carbonate, ledge forming, grayish white, white; alternates with marl, bentonitic seams locally recessive; medium gray; pyrite nodules common, weather to limonite; thickness 325-420 ft. In East Texas and Gulf Coast to Rio Grande and In north, central, and south Texas including Quaternary for all of west Texas- Chalk, massive, some interbeds and partings of calcar. clay, lt. gray; middle part mostly thin-bedded marl with interbeds of massive chalk, hard lime mudstone to soft chalk; lt. gray; weathers white; marine megafossils scarce; chalk is mostly microgranular calcite with minor foraminifer tests and Inoceramus prisms, local thin bentonitic beds in lower part, thickness 600 +- ft. thickness 1,200 ft in Crystal City-Eagle Pass Sheet (1976). Ouachita tectonic belt province, Fort Worth syncline. Unit is below Taylor Marl, Ozan Formation, Upson clay, Anacacho Limestone, or Pecan Gap Chalk and is above Eagle Ford Formation or Boquillas Flags.

Lithology: Major:{marlstone,chalk}, Minor:{claystone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Early Cretaceous
100.5 - 145 Ma

ID: 3186170
Mesozoic sedimentary rocks

Age: Early Cretaceous (100.5 - 145 Ma)

Lithology: Carbonate,shale

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

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