Richard Owen,
Antiquity of Man as Deduced from the Discovery of a Human Skeleton
(1884)
“ But, whatever its physical composition, we may regard the stratum as being that on which the man moved who therein left his bones. As man he must have breathed an aerial atmosphere—in other words, have trod the then surface of the earth. To receive the overlying bed the supporting one subsided; the level of the ground there to that extent has consequently changed. Both strata are now very far down. Here we may pause to consider for how long a period the surface of the banks of the Thames has remained at its present level. ”
