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over the hard sandstones on the right bank of the stream above the electric light plant (5, Fig. 2).

This bed was easily followed to the quarry, where it constitutes the overlying mass which it is necessary to remove in order to uncover the workable sandstone below. At this point the bed also contains layers of soft white sandstone more or less massive. Large blocks of this had been thrown down and lay strewn at the foot of the quarry. On the surfaces of these and more or less scattered through their mass were impressions of dicotyledonous leaves of Dakota types. The shales were also found in places above the quarry, and some of these yielded very good specimens (4, Fig. 2).

The massive sandstone of the quarry is entirely barren so far as could be ascertained, and no fossils were found at any point lower than the bed that overlies it. For a long distance on both sides of the cañon it forms the crest of the ridge, presenting a more or less abrupt escarpment of from 25 to 75 feet. Below it, higher up the stream, beds of softer sandstone, argillaceous shales, and carbonaceous layers with impure coal seams, all highly charged with gypsum, come down to the bed ofthe stream, and are finally seen resting upon the Jurassic clays, which in turn overlie the Red Beds. Some distance below Hot Springs the Cretaceous can be seen at the summit of the cliffs, with the whole thickness of the Jurassic below them and the Red Beds at the base. At and about Hot Springs there are some heavy beds of conglomerate about which little seems to be known.

The following is the Cretaceous section as measured: