Osha Canyon Formation

[kgbudge]

Visiting the Osha Canyon Formation in the Jemez Mountains, New Mexico.

 

Upper part of the formation.

 

The massive sandstone is the Sandia Formation. Underneath is the Pennsylvanian Osha Canyon Formation.

FInds:

 

 

Crinoid stem segments, a rugose coral, a couple of echinoderm plates, and a worm burrow cast.

 

Whole bed of brachiopods:

 

 

Composita brachiopods?

 

 

I was shown this site by a semi-professional geologist who calls it The Nursery because there are huge numbers of unusually small brachiopods.

 

Spirifers? some are silicified

 

[Myrmica]

Check out Sutherland & Harlow 1967  Late Pennsylvanian brachiopods from north-central New Mexico.  Journal of Paleontology 41: 1065-1089.  It may help with IDing some of your specimens.

[Fossildude19]

Have a look at this post:

 

 

[kgbudge]

Te Osha Canyon Formation is significantly earlier in the Pennsylvanian than the Madera Group, but those are nonetheless helpful. And I'll doubtless be looking at Madera Group beds again.

[piranha]

 

DuChene, H.R., Kues, B.S., Woodward, L.A. 1977
Osha Canyon Formation (Pennsylvanian), New Morrowan Unit in North-Central New Mexico.

American Association of Petroleum Geologists, Bulletin, 61(9):1513-1524