-175- Section 18 contd. Thicknes (feet) columnals; with interbedded shale, 4 or 5 conglomerates 1 to 2 feet thick . . . . 51 4. Calcirudite, medium to light gray lime- stone cobbles, 4 inch diameter, fine chert and quartzite pebbles, 1 inch dia- heter, 3 foot beds . . . . . . . . . . . 56 3. Shale, medium gray, badly metamorphosed . . . 23 2. Calcirudite, dark and light gray lime- stone cobbles, 4 to 6 inch diameter, finer black chert pebbles . . . . . . . . . 3 1. Shale, medium gray; and siltstone, brown weathering, 6 inches thick; badly meta- morphosed, some plant fragments . . . . . . 78 Igneous intrusion below. Section 19 This section begins in the low hills about one mile west of the mouth of Geologist's Canyon, Wolf Camp Hills, and continues up the lower slope of the Leonard escarpment. This is approximately the same locality as the lower portion of section 23 of P.B. King, 1930.