Latitude & Longitude (WGS84):	33° 1' 59'' North , 102° 19' 59'' West
Latitude & Longitude (decimal):	33.03333,-102.33333
GeoHash:	G#: 9tz5zme1h
Locality type:	Meteorite Fall Location
Meteorite Class:	H5 chondrite meteorite
Meteoritical Society Class:	H5
Metbull:	View entry in Meteoritical Bulletin Database
Köppen climate type:	BSk : Cold semi-arid (steppe) climate

Ordinary chondrite (H5)
Find,1940; 50.1 kg

A meteoritic stone was found. Other small and large meteoritic stones were found in nearby areas over the next few decades, but they are mostly or entirely pieces of separate meteorites. The rather well-equilibrated olivine and orthopyroxene compositions are characteristic of H5 ordinary chondrites. Fe-Ni metal (mostly kamacite) is reported, but taenite is present only in very small quantities. Ramdohr also identified troilite and accessory chromite, but the total number of mineralogical phases reported in the sources cited here are unusually sparse. Weathering is extensive. While pre-terrestrial magnetite is often found in ordinary chondrites, the magnetite reported here is a terrestrial weatherate.

U,Th-He and cosmic ray exposure ages of 2.73 Ga and ~6.2 Ma, respectively, have been reported.

The main mass has been at Arizona State University (Tempe) for several decades [23.1761 kg in 2016] .

What's in a name?? — Wellman (a) is one of 5 meteorites listed by the Meteoritical Society as found in the Wellman Region [Wellman (a), Wellman (b), Wellman (c), Wellman (d), Wellman (e)]. These meteorites apparently include a minimum of 3 separate unobserved falls, but two specimens are incompletely classified and cannot be definitively matched to any of the other named meteorites.

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: 2965321

Blackwater Draw Formation Age: Pleistocene (0.0117 - 2.588 Ma) Stratigraphic Name: Blackwater Draw Formation Comments: 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. 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