Latitude & Longitude (WGS84):	35° 9' North , 102° 43' West
Latitude & Longitude (decimal):	35.15000,-102.71667
GeoHash:	G#: 9wnzywu58
Locality type:	Meteorite Fall Location
Meteorite Class:	H4 chondrite meteorite
Meteoritical Society Class:	H4
Metbull:	View entry in Meteoritical Bulletin Database
Köppen climate type:	BSk : Cold semi-arid (steppe) climate

Ordinary chondrite, veined (H4)
Find, 1936; 22.6 kg

A weathered meteoritic stone of 6.3 kg was recovered in 1936 by Harvey Nininger with a second stone recovered later. Inspections reveal chondrules and chondrule fragments within a somewhat equilibrated matrix. Dominant and mostly equilibrated olivine (Fa19) and low Ca-pyroxene are characteristic of H4 chondrites. A specimen analyzed by Ramdohr (1973) was so weathered that he was unable to identify a single primary opaque. Apparently, however, the meteorite has been useful in chronological studies.

A U,Th:He age of t =1.85 Ga bespeaks of a major collision in the long interval between formation of the original parent body (OPB) and more recent events. A reported cosmic ray exposure (CRE) age of t ~14.2 Ma presumably reflects events during or after injection of the pre-terrestrial meteoroid into an earth-crossing orbit.

As with many meteorites collected by Harvey Nininger, the main mass is held by the Center for Meteorite Studies at Arizona State University [7.7212 kg in 2017].

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

Pleistocene 0.0117 - 2.588 Ma ID: 2729824

Blackwater Draw Formation Age: Pleistocene (0.0117 - 2.588 Ma) Stratigraphic Name: Blackwater Draw Formation Description: Sand, fine- to medium-grained quartz, silty, calcareous, locally clayey, caliche nodules, massive, grayish red; distinct soil profile; thickness as much as 25 ft. feathers out locally. Comments: Original map source: Stoeser, Douglas B., Shock, Nancy, Green, Gregory N., Dumonceaux, Gayle M., and Heran, William D., 2005, Geologic Map Database of Texas, USGS, DS 170, scale 1:500,000. Lithology: Major:{sand}, Minor:{fine alluvium}, Incidental:{silt} 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]

Paleocene 56 - 66 Ma ID: 3193162

Cenozoic sedimentary rocks Age: Paleocene (56 - 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]

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

References

External Links