EXPLORING EXPEDITION FROM SANTA Ffi TO JUNCTION OF GRAND AND GREEN RIVERS. 



DESCRIPTIONS 



OF THE 



CARBONIFEROUS AND TR1ASSIC FOSSILS 



COLLECTED ON THE 



SAN JUAN EXPLORING EXPEDITION UNDER CAPT. J. N. MACOMB, U. S. ENGINEERS. 



BY 



J. S. NEWBERRY. 



GKOLOGIST OF THE EXPEDITION. 



