Tilden, McMullen Co., Texas, USA
Latitude & Longitude (WGS84): | 28° 27' 41'' North , 98° 32' 57'' West |
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Latitude & Longitude (decimal): | 28.46151,-98.54938 |
Köppen climate type: | Cfa : Humid subtropical climate |
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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 Macrostrat.org
Cenozoic 0 - 66 Ma ID: 3186031 | Cenozoic sedimentary rocks Age: Cenozoic (0 - 66 Ma) Lithology: Sedimentary rocks 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] |
Late Eocene 33.9 - 37.8 Ma ID: 2817928 | Manning Formation Age: Eocene (33.9 - 37.8 Ma) Stratigraphic Name: Manning Formation Comments: Plum Bentonite included (Seguin Sheet, 1974); clay and sandstone, chiefly clay, massive to laminated, sl. carbonaceous or lignitic, bentonitic, tuffaceous, thin interbeds of tuffaceous siltst; sandst in upper part, v. fine to fine grained, silty, well bedded to crossbedded; in lower part tuffaceous, contains fossil wood; thickness 250-350 ft. In East Texas and Gulf Coast to Rio Grande: Quartz sand, clay, and lignite. Sand, fine to med. grained, lignitic, light gray, weathers med. gray. Clay, sandy, lignitic, brn-gray; weathers pal brn-gray. Lignite brnish-black, weathers brn-gray. Fossil wood abdt. Thickness 200 ft. Lithology: Major:{sandstone mudstone}, Incidental:{lignite} 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] |
Eocene 33.9 - 56 Ma ID: 3264065 | Jackson Group, undivided Age: Eocene (33.9 - 56 Ma) Stratigraphic Name: Jackson Group Description: Bentonitic clay, sandstone, siltstone, shale, and tuff; some clay is carbonaceous and lignitic; sandstone and siltstone are tuffaceous and glauconitic; contains oysters, pelycepods, and burrows. About 250–266 m thick Reference: Page, W.R., M.E. Berry, D.P. VanSistine, S.R. Snyders. Preliminary Geologic Map of the Laredo, Crystal City–Eagle Pass, San Antonio, and Del Rio 1° x 2° Quadrangles, Texas, and the Nuevo Laredo, Ciudad Acuña, Piedras Negras, and Nueva Rosita 1° x 2° Quadrangles, Mexico. U.S. Geological Survey Open-File Report 2009-1015. [170] |
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