186 Lee — Lower Paleozoic Rocks of Central New Mexico. 



Ordovician (Beek man town) age occnr in some places, but are 

 apparently absent in other places. (3) Rocks of Richmond 

 age are well developed and rest in some places upon Beekman- 

 town and in other places apparently upon Cambrian. (4) The 

 Richmond is separated from the Beekmantown by an uncon- 

 formity that apparently represents a long time interval. (5) 

 Certain elements in the fauna which is here described as Rich- 

 mond are suggestive of Silurian rather than Ordovician age, 

 and some of the cherty limestone may belong in the Silurian 

 system. (6) Rocks of possible Devonian age occur in the 

 Caballos Mountains, but no fossils were found in them. (7) 

 No Mississippian rocks were found and Pennsylvanian lime- 

 stones rest in some places upon the Devonian (?) shale and in 

 other places upon the Ordovician chert. 



