Note 35 — APPENDIX.
Reading edition
134. These specimens have a wood-brown colour internally, and appear to be composed of minute grains of quartz, variously coloured, white, yellowish-brown and black, cemented together by an earthy basis. It is a hard and apparently durable stone, occurring in layers an inch thick, and having its seam-surfaces of a grayish-black colour, with little lustre, as if from a thin coating of bituminous clay.
135, are specimens of a more compact, harder, and finer-grained quartzose sandstone, with less cement, and of a deeper bluish-gray colour.