Greenhorn Formation

Limited to northeastern area; the upper member (Bridge Creek Limestone) can be traced into western area where it is commonly shown as a bed-rank unit in Mancos Shale on detailed maps.
State New Mexico
Name Greenhorn Formation
Geologic age Turonian to Cenomanian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed, Calcareous)no lith description on map - description from GEOLEX
Sedimentary > Carbonate > Limestone (Bed)no lith description on map - description from GEOLEX
Incidental
Sedimentary > Clastic > Mudstone > Claystone > Bentonite (Bed)no lith description on map - description from GEOLEX
References
NGMDB product
Counties Colfax - Harding - Mora - San Miguel