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Helotes, Bexar Co., Texas, USA

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Latitude & Longitude (WGS84): 29° 34' 40'' North , 98° 41' 22'' West
Latitude & Longitude (decimal): 29.57778,-98.68945
GeoHash:G#: 9v3b622x1
Köppen climate type:Cfa : Humid subtropical climate

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Standard Detailed Strunz Dana Chemical Elements

Mineral List

Detailed Mineral List:

Formula: (Fe,O,OH,H2O)
Reference: www.lib.utexas.edu/books/dumble/publications/05/05a062a.html.
'Limonite var: Bean Ore'
Formula: FeO(OH) · nH2O
Reference: www.lib.utexas.edu/books/dumble/publications/05/05a062a.html.

List of minerals arranged by Strunz 10th Edition classification

Unclassified Minerals, Rocks, etc.
'var: Bean Ore'-FeO(OH) · nH2O

List of minerals arranged by Dana 8th Edition classification

Unclassified Minerals, Rocks, etc.
'var: Bean Ore'-FeO(OH) · nH2O

List of minerals for each chemical element

H Limonite (var: Bean Ore)FeO(OH) · nH2O
H Limonite(Fe,O,OH,H2O)
O Limonite (var: Bean Ore)FeO(OH) · nH2O
O Limonite(Fe,O,OH,H2O)
Fe Limonite (var: Bean Ore)FeO(OH) · nH2O
Fe Limonite(Fe,O,OH,H2O)

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

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]

Early Cretaceous
100.5 - 145 Ma

ID: 3264505
Glen Rose Formation

Age: Early Cretaceous (100.5 - 145 Ma)

Stratigraphic Name: Glen Rose Formation

Description: Limestone, dolostone, and marl; limestone is mostly aphanic and marly; dolostone is finely crystalline and porous; contains rudistids, oysters, and echinoids. Forms part of the Trinity aquifer. About 300–1,000 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]

Early Cretaceous
100.5 - 145 Ma

ID: 3243150
upper member of the Glen Rose Limestone

Age: Early Cretaceous (100.5 - 145 Ma)

Stratigraphic Name: Glen Rose Limestone

Description: Heavily bioturbated, evaporite beds, caves. 0-120 (absent in nor feet thick.

Comments: Upper zone of the Trinity aquifer

Lithology: Evaporites, wackestone, packstone, miliolid grainstone, argillaceous limestone, heavily bioturbated; occasional dinosaur tracks

Reference: Clark, A.K., J.A. Golab, and R.R. Morris. Geologic framework and hydrostratigraphy of the Edwards and Trinity aquifers within northern Bexar and Comal Counties, Texas. doi: 10.3133/sim3366. U.S. Geological Survey Scientific Investigations Map 3336. [164]

Early Cretaceous
100.5 - 145 Ma

ID: 2947447
Glen Rose Limestone

Age: Early Cretaceous (100.5 - 145 Ma)

Stratigraphic Name: Glen Rose Limestone

Comments: In Western part of Trans-Pecos alternating resistent ls. ledges and soft marls. Includes basal Cretaceous conglo. Present in Solitario Uplift and in Horshoe Mesa-Pine Mtns area. 335-500 ft in Big Bend Natl Park, 733 ft measured in Black Gap area (Emory Peak-Presidio Sheet) In North, central, and south Texas including Quaternary for all of west Texas- Brownwood Sheet (1976)--Glen Rose Limestone- limestone, clay, and sand alternating, some sandstone. Stairstep topography. Limest. is aphanitic to fine grained, argillaceous, silty, local dolostone beds, limest. resistant, or chalky to hard, surfaces nodular, distinctly bedded, foraminifera and marine megafossils molluscan steinkerns, rudistids, oysters, and echinoids common. Sand, thinbedded, brn-yell, gray. Clay and claystone is in part sandy, marly, recessive; sand is gray to brn-yell. thickness 40-400 ft. stated to be about 800 ft in Seguin Sheet (1974), 1,750 ft thick in subsurface of northern Maverick Co., TX. In Eastern part of Trans-Pecos and High Plains- limestone, clay, and sand. Limestone clayey, silty, sandy, thin beds, brownish yellow. Clay in part sandy. thickness 40 ft on Sherman Sheet (1967).

Lithology: Major:{limestone,marlstone}, Minor:{sandstone,claystone}, Incidental:{conglomerate}

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]

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

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