136 Scientific Intelligence. 
In wary tony they woe oun < pana 
‘Alluviad. vaniaies idan ugh a very as amount a the gold 
annually obtained was no doubt originally 
rous veins, not more than about one-third of the precious metal 
collected is procured directly from that source. The larger pro- 
0 
wood Ww 
silicified, or is <ceorieney by iron 
e more clayey iretk of i deposits leaf beds and impres 
sions of leaves are not unfrequently found; and an examination 
of these made by Dr. Newberry authorizes the Saotaeic net wi 
auriferous deposits lying beneath the lava are of crete age a 
that ote probably belong to the later Pliocene epo og 
throughout the whole ete = these de- 
posits, not, scan with uniformity, but always in greater owen 
near the bottom, and more particularly in direct contact 
ele a which is invariably a a and worn ¥ 
The 
oer, Hill a mi resulting the junction of pent pebbles, 
und completely lined: scien ses aa fined crystals of quart — 
These id not show, under the mi roscope, the usual fluid-cavities — 
of quartz of the ordinary quartz va of the country. “ | 
Where the cementing material of the e conglomerate chiefly com 
sists of pyrites, the enclosed trunks of trees are usually replaced 
Aaa 
+ a 
as 
ae 
