440 PREHISTORIC EUROPE. 



6. Vegetable matter, rushes, fallen trees, leaves, roots, moss, the Feet. 



elytra of coleopterous insects ..... 1 



7. Moss, hazel-nuts, sticks, on pebbles of killas, growan, etc. . 3 



8. Eough tin-ground ....... 5 



Another section given by Mr. Smith is as follows : — 



Section of Pentewan Work. 



Sandy clay, stones, gravel ...... 9 



Peat, with roots and leaves ...... 7 



Sand, with branches and trunks of trees .... 8 



Finer sand, with shells, bones, horns, vertebra of a whale, 



human skulls . . . . . . . .12 



Coarse gravel ......... 2 



Close sand with clay, becoming peaty near the base . . 12 

 Loose stones and gravel, 1 foot thick resting on tin-ground. 



Besides the buried forests which are revealed to us by the 

 tin-workings, geologists have long been familiar with the fact 

 that the Cornish coast exhibits in many places the phenomena 

 of submarine peat and trees. These, there can be little doubt, 

 are merely prolongations seaward of the peat and buried trees 

 that are cut through by the stream-tin works. But whether the 

 submerged forests of the sea-coast always pertain to the same 

 level as the vegetable layer which is usually found resting 

 directly upon the stream-tin gravels may be questioned. Mr. 

 Carne, however, thought he could correlate the bottom forest- 

 bed (No. 4) in the following section with the famous submerged 

 forest of Mount's Bay : — 



Section at Huel Darlington Mine, Marazion Marsh. * 



1. Gravel and loose ground ...... 8 ft. 



2. Peat, with minute woody fibre . . . . . 4 ft. 



3. "White sand, with Cardium edule . . . . . 12 ft. 



4. Oak and hazel trees lying in all directions ; hazel-nuts 



loose and on their branches ; a piece of oak, shaped as 



if for a boat-keel . . . . . . 1 ft. to 2 ft. 



5. Solid hard peat, closer than the upper bed . . . . 3 ft. 



6. Alluvial tin-ground on slate-rock . . . . 4 ft. 



1 Trans. Royal. Geol. Soc. Cornwall, vol. vi. 



