‘SHUMARD—GEOL. OF N. MEXICO. 353 
other fossils of the Cretaceous Group.* Beneath this sand- 
stone oceurs dark bituminous shale, which we regard as form- 
ing the superior part of the Coal Measures. Underneath these, 
_, we have heavy-bedded = ih gray limestone of the 
Measures, containing Fusulina cylindrica(?), Produc- 
tus costatus, As ee subtilita, Ehynchoa and Cyatho- 
