72. Blue shale, becoming calcareous towards the top, where shells are plentiful.
71. Reddish false-bedded sandstones, with bands of reddish and blue shale.
70. Basalt in two sills separated by 2 or 3 feet of sandstone and shale.
69. Dark fissile sandy shale, passing up into white shaly sandstone, and including a thin parting of impure coal.
68. Limestone (Hurlet or Main Seam) in a number of bands having a united thickness of 25 feet. Abundant fossils.
67. Black shale becoming calcareous at top, and then enclosing abundant Productus, etc., 8 or 10 feet.
66. Red and green tufaceous marl and tuff. About 30 feet.
65. Basalt, the lower part strongly amygdaloidal.
64. Tufaceous red marl and tuff; comparatively coarse below, becoming finer above, 3 or 4 feet.
63. Basalt, earthy and amygdaloidal, with an irregular bottom involving masses of the shales below.