CORKISH POST-TERTIARY GEOLOGY. 29 



Section at Pendelow, St. Austell Valley ' Deposits wrouglit in 

 1873: 



1. Granitic sand and gravel, divided by tliin partings of silt into 



many separate beds , 6ft. to 8ft. 



2. Peat (fen) often mixed witb and sometimes interlaid by micro- 



scopic layers of granitic sand T^jft. to 2ft. 



3. Granitic sand and gravel in many layers, the lower part being 



much mixed with hardened mud 7ft. to 8ft. 



4. Peat, very closely resembling No. 2 



5. Granitic sand and clay, scarcely differing from No. 1 Sin. to 6in. 



6. Peat, sometimes mixed with stems of fern, nuts, leaves, branches 



of furze, alder, and hazel, and trunks of oaks; here and there 



a few flints have been very rarely discovered 1ft. Oin. 



7. Tin ground, of granitic, schorlaceous and quartzose, matter, 



mixed with the oxide of tin, usually as sand and gravel, but 

 sometimes including subangular masses of granitic rocks and 



vein stones, and more rarely thin scales of slate 2ft. to 4ft. 



Upon granite shelf unequally eroded. 



Section of Lower Creamy Works,- in a part of Ked Moor, in 

 Lanlivery. (N. of St. Austell.) 



1. Peat 2ft. to 3ft. 



2. Granitic, though slightly quartzose, clay of a greyish hue, 



mixed with lamina3 of slate 1ft. to 3ft. 



3. Tin ground of angular, subangular, and spheroidal masses of 



pale-brown quartz, fragments of felspar mottled dark blue 

 and yellowish brown, clay and granitic gravel, thinly mixed 

 with rounded masses of tin stone. Flints of considerable size 

 occur at intervals, and particles of gold less frequently ... 4ft. to 5ft. 



The roots of marsh plants peneti-ate to a depth of from 2 to 3 

 feet into the tin ground. 



Shelf of pale-buff coloured clay. 



The occurrence of flints in the tin ground is remarkable, unless 

 by that name siliceous fragments of Palaeozoic rocks are meant. 

 Section of Carnon Works, in 1807, by Mr. E. Smith r^ 



1. Mud and sand 7ft. Oin. 



2. Granitic gravel, with a few shells (charcoal P) 4ft. Oin. 



3. Pine gravel, shells, mud; irregular strata of oysters extend to 



within 4 or feet of the tin ground 12it. Oin. 



4. Closer mud, shells, trunks and branches, sometimes exhibiting 



the appearance of having been cut by an axe ; horns and 



bones of stags, human skulls 19ft. Oin. 



5. Tin ground 1ft. to 6ft. 



1 Henwood, Journ. Eoy. Instit. Corn. vol. iv. p. 213. 



2 Ibid. p. 214. 



3 Trans. Eoy. Geol. Soc. Corn. vol. iv. p. 408. 



