Penny Blood: Serial Sensation and Working-Class Entertainment — page 232: what you’re looking at

Machine-transcribed from the original scan — historical spelling and the odd misread are preserved.

CH. Xv1.] ON FAULTING. 215 whence, equating these quantities, kle = 3, (b) — 3 (a) + (a) — & (8), which is the datum-level equation with the sign of ¢ changed. ~ It follows as before that = (b) — %(a)_o-p Z(a)—2(8) pp’ = 0104, if we suppose o and p to be the densities of basalt and granite. Combining this with the expression for kle we get, x (b) —& (a) =0:09 Ke. Whence 2 (5) — & (a) is a positive quantity. Indeed generally, 3 (b) — 3 (a) = —— ke; + and 18 positive because o is greater than p. But = (b) —3(a) is the mean depression of the tract below the mean level, Hence we see that such faulting as arises from subsidence owing to contraction, must on the whole depress the surface of the tract disturbed by it. But the depression will be small because — = P is small on account of the difference of the densities being small compared with the greater. The general conclusion now offered for the consideration of geologists therefore is, that both corrugation and faulting are ultimately dependent upon the contraction, and consequent fissuring, of the crust, when it undergoes those changes, varying in degree from mere solidification to intense plutonic action, which convert aqueous sediments into denser rocks, and are all included under the generic term, metamorphism. The fissuring consequent on the contraction, which accompanies these changes, 1 p. 118, GONG oOo SS (CO)