tious thought that the Triassic is about 106-113 feet thick, the marine Jurassic 170 ft; the fresh water Jurassic 135-150 ft and the Dakota sandstone 45. The total thickness of strata exposed on the railroad track to the top of Como Bluff from 446-478 feet, Estimated. However in new arrangements Broadhead's previous section I see no reason for assuming that the Dinosaur beds are fresh water since Knight says he found in the Dakota sandstone a marine vertebrate. If this is true then the Jurassic Dinosaur beds have marine strata far above below. The chance of a mari fame in these beds in the strongest argument for their fresh water origin due if the chalk can be of marine origin. After leaving Medicine Bow river and looking for to Como Bluff another anti- cline came into our which is very but no quiet at all with it. I have taken