Note 21 — Chapter I
Reading edition
I am not certain that I fully comprehend the brevity of Mr. Eaton’s division of this formation of the English geologists; but if I do so, he deduces from it, or from its equivalent in American geology, 1. Second graywake, 2. Calciferous sand-rock, 3. Silicious lime rock, 4. Metalliferous limerock.