ON THE DETRITAL TIN-ORE OF CORNWALL. 243 
PENTUAN.* 
(2). A bed of silt sometimes con- 
taining animal and vege- 
table remains ....2° feet 
thick ; 
(1). Abed of sea-sand containing 
animal and vegetable 
remains..20: feet thick; 
(3). a op 0 0UPES TOOL. gp 
(1). A bed of silt containing 
animal and _ vegetable 
remains .. 2° feet thick; 
(3). ” Ee - 10° 9? ” 
SANDRYCO CKt near PORTH. 
(QO), Jeeehiooe odode 4-1 feet thick 3) (Op Ces odcs00 1:4 foot thick ; 
(3). Clay, containing vegetable 
matter, with traces of the 
phosphate of iron 3:8 feet 
thick; 
4 (4). Sea-sand mixed with clay 
\ 3° feet thick ; 
(5). Sea-sand fragments of shells 
and of clay-slate....4° feet 
thick ; 
(6). Coarser sand, without shells 
Ke 6° feet thick ; 
are separ. 
ated by 
(2). Abed of sea-sand containing 
shells .... 0:3 foot thick. 
are separ- 
ated by 
are separated by 
UieEPECAtirctelereieiee) Os. 55, 9511 'a) 
The human remains were discovered{ at— 
Carnon...... 58 feet.) 2, seeesees 64 feet.) 8S ....46 feet below.) # 
= Se : 
2k Ba +f 4 ,, above. id 
Pentuan..20-40 ,, .J 2? 14-34 ,, 3  .. (14 ,, below.j 6 
Neither speculation on the causes of these alternations, of fresh- 
water with marine substances, and of animal with inorganic matter ; 
nor conjecture whether the human remains at Carnon and at Pen- 
‘tuan may—though they are imbedded at unequal depths and in 
different parts of the series—have belonged to the same, or to 
distant periods, can—especially in the absence of a perfect skull 
from Carnon§—properly find place in a mere descriptive memoir. 
_In the shallow stream-works of the moorlands the upper por- 
* Smith, Geol: Trans: iv, (O.8.) p. 406. Colenso, Cornwall Geol: 
Trans: iv, pp. 32 —37. 
+ Rashleigh, Cornwall Geol: Trans: ii, p. 282. 
+ “Assuming these facts to be correct, we seem to have evidence that 
“ Cornwall was inhabited by human beings when the earlier accumulations 
‘‘of detrital matter were effected over the tin-ground.” 
De wa Becue, Report, p. 407. 
§ Table Ill, Notey. 
