Base of Black Shale 617. A short distance west of Harmon's creek, the fossiliferous Richmond beds occur at water's edge. The base of the Black Shale is exposed 58 feet above the river and the Black Shale seems to be 33 feet thick. The top of the Madison beds is softened to a greenish chalky clay. The Black Shale rests on the Med. beds; from the anticline described in the last section westward the rocks dip southwestward, but at the Harmon shoals they dip northeastward, and west of Harmon creek the base of the Black Shale is almost as far above the river as at the anticline. Base Black Shale 618 Monday, July 24 '99, About ½ mile E of Difficult creek. The following section is exposed: 50 ft. limestone weathering to sandy rock. 11 ft. white limestone. 22 ft. sandy rock paymnds, formerly limits fine exposures. 32 ft. dark shale rock, with occasional thin limestone layers. 64 ft. crinoidal limestone. 76½ ft. Sandy stone, once a limestone? 80 m exposures. 6½ ft. massive layered limestone. 10 ft. rubble limestone. 1 ft. fine grained limestone 66 ft. Wavy dark blue shale weathered brownish Nodular layer gray shale. 45 ft. Black Shale 51 ft. Richmond beds When part with certain triviate abundants When part with Gastropods + Pleurodonta.