portion of its surface which, was afterwards occupied by the Fluvio- marine and the Marine crags ; and the beds are placed in such close proximity that, notwithstanding the long period of time that may have intervened, it is difficult to separate them, especially as the crag-shells are laid upon and mingled with the stony bed.
Coast Section.
Inland Section.
Mundesley, 20 miles to Norwich.
Bacton, 18 do do.
Lower Boulder-clay.
Pebbly Beds.
Tellina balthica Crag.
Chillesford Clay.
Marine Crag.
Fluvio-Marine.
Fresh Water.
Forest-bed, without Mastodon arvernensis.
Antwerp Beds, with Mastodon arvernensis.
London Clay.
Lower Boulder-clay.
Pebbly Beds.
Tellina balthica Crag.
Chillesford Clay.
Marine Crag.
Fluvio-Marine.
Chalk.
Water Lines.
Chalk.
The highly mineralized and decayed condition of the bones and teeth indicates long exposure to the atmosphere ; and, together with the disintegration and wearing down of the chalk by pluvial and atmospheric action, may account for their not being found in the upper part of the chalk hills. An act of justice may still be done to the memory of the illustrious Cuvier, who expressed his utter incredulity when the Mastodon's tooth found at Whittingham, near Norwich, by the father of English geology, was shown to him, and he was assured that it came from the Norwich crag. He affirmed that it was next to impossible ; and the result of the above observations tends to prove that Cuvier was correct in his opinion that the Mastodon belonged to an older deposit.
A break is here established between the stony bed which contains the Mastodon and the Fluvio -marine which contains no
