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Interstate highway 30 & Belt Line Road roadcut, Grand Prairie, Dallas Co., Texas, USA

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Latitude & Longitude (WGS84): 32° 45' 30'' North , 96° 59' 41'' West
Latitude & Longitude (decimal): 32.75852,-96.99487
GeoHash:G#: 9vg42gd2p
Locality type:Road Cutting
Köppen climate type:Cfa : Humid subtropical climate

Transitory road-cut during Interstate highway widening project in 2001. About 100 "flats" of unusual pyrite nodules were removed from Eagle Ford shale outcrop by collectors while the locality was open.

Alternative Label Names

This is a list of additional names that have been recorded for mineral labels associated with this locality in the minID database. This may include previous versions of the locality name hierarchy from mindat.org, data entry errors, and it may also include unconfirmed sublocality names or other names that can only be matched to this level.

I-30 & Belt Line Road roadcut, Grand Prairie, Dallas Co., Texas, USA

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

1 valid mineral.

Detailed Mineral List:

Formula: FeS2
Reference: Nash, K. (2002) "Recent Finds in Dallas County, Texas", Mineral News, Vol. 18, No. 11.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2

List of minerals for each chemical element

S PyriteFeS2
Fe PyriteFeS2

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

Holocene - Pleistocene
0 - 2.588 Ma

ID: 2893454
Terrace deposits

Age: Pleistocene (0 - 2.588 Ma)

Comments: Sand, silt, clay, and gravel in various proportions, with gravel more prodominent in older, higher terrace deposits. Locally indurated with calcium carbonate (caliche) in terraces along streams. Along Colorado River clasts mostly limest., chert, quartz, and various igneous and metamorphic rocks from Llano region and Edwards Plateau. Includes point bar, natural levee, stream channel deposits along valley walls; probably in large part correlatives of Deweyville, Beaumont, Lissie, and Willis deposits. In upland regions (Rolling Plains, Edwards Plateau, etc.) unit includes fluvial terrace deposits, undivided. Light-brown, reddish-brown, gray, or yellowish-brown, gravelly quartz and lithic sand and silt to sandy gravel (Moore and Wermund, 1993). Deposits become increasingly fine grained on Coastal and Nueces Plains. Locally, calcium carbonate-cemented quartz sand, silt, clay, and gravel intermixed and interbedded. Low terraces of major rivers are capped by 2-4 m of clayey sand and silt. Sandy gravel on higher terraces varies somewhat in composition from river to river. Gravel commonly is rounded to angular limestone and chert pebbles and cobbles, some boulders, sparse igneous pebbles along Brazos river in places. In Bastrop Co., a deposit 27 m above Colorado River contains the Lava Creek B (Pearlette O) volcanic ash (age 0.6 Ma). Along the Frio, Leona, and Sabinal Rivers east of Uvalde, gravel is chiefly basalt and pyclastic clasts, locally cemented by iro oxide. Gravel along the Rio Grande is subrounded clasts of locally derived limestone and chert and rounded clasts of basalt, volcanic porphyry, quartzite, milky quartz, and banded chalcedony derived from the west.

Lithology: Major:{sand}, Minor:{clay,gravel}

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 Macrostrat.org, used under Creative Commons Attribution 4.0 License


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Nash, K. (2002) "Recent Finds in Dallas County, Texas", Mineral News: 18: 11.

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