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II.—Note on the Silicified Woods of California

Published online by Cambridge University Press:  01 May 2009

Extract

The deep placers of California are often covered by a thick capping of lava; in other places, the eruptive matter overlying the auriferous gravels occurs in the form of columnar basalt, beneath which is found the auriferous strata of sand, clay, and gravel. These deposits often contain immense numbers of large tree-trunks, which, with those portions of their branches which remain, are either silicified, or are converted into a lignite, often containing a considerable amount of iron pyrites.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1873

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References

page 98 note 1 Geological Survey of California, pp. 250–251.