Subject ASC0001gh4
The Quarterly journal of the Geological Society of London.
v.10 (1854), Page 316 (1854)
Smithsonian Libraries
BHL Page 35013267
Keywords
gold-fields limestone clay mica slate geology mining California gold fields section cross-section California strata Murphy's Deep Diggings shafts volcanic ashes calcareous deposits granite cliff conglomerates Murphy's diggings gold deep diggings slate gold fields Diggings Scale drawing Cross Section Gold fields gold diggings gold fields california