Hygiene sandstone passes through the butte. We ate lunch, fed the horses, then walked to the bluff NE of the butte. I photographed the bluff, with red Pleistocene conglomerate resting on lower Fox Hills sandstone, this in turn underlaid by black Pierre shales. One sandstone (Dakota or Arikaree) boulder in the conglomerate is 2 ft in diameter, We collected Fox Hills fossils at the bluffs, then collected Hygiene fossils S of Round Butte where the strike is S 32˚ W and dip is 54˚. The concretions are similar to those at Fossil Ridge. Some of the Fox Hills fossils were found in concretions like those E of White Rock fault. The Pleistocene conglomerate contains much agatized wood or wood jasper etc. I found a sandstone boulder 3 ft. in diameter in it. We started back at 6:10, reached Wellington at about 8:40, very tired. Team $4.00.
