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San Andres Formation

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Limestone and dolomite with minor shale. Guadalupian in south, in part Leonardian to north.
State New Mexico
Name San Andres Formation
Geologic age Guadalupian and Leonardian
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Minor
Sedimentary > Clastic > Mudstone > Shale (Bed)
Incidental
Sedimentary > Chemical > Chert (Bed)no lith description on map - description from GEOLEX - cherty limestone
References

Green, G.N., Jones, G.E., and Anderson, O.J., 1997, The Digital Geologic Map of New Mexico in ARC/INFO Format: U.S. Geological Survey Open-File Report 97-0052, 9 p., scale 1:500,000.

https://pubs.er.usgs.gov/publication/ofr9752
NGMDB product
Counties Chaves - Cibola - DeBaca - Dona Ana - Eddy - Guadalupe - Lincoln - McKinley - Otero - San Miguel - Santa Fe - Sierra - Socorro - Torrance - Valencia