New theory for the occurrence of gold nuggets in the “Early Tertiary Auriferous Gravels” of California

Gold Nuggets—Evidence of Past Climates and Former Landscapes by Odin Christensen presents a plausible explanation for the rich concentrations of coarse placer gold in California’s Early Tertiary auriferous rivers which largely drained a region of Nevada with a dearth of lode gold deposits.

Now posted in References.   here


Geology of the Ione Formation in the Ione Area

This document is now available in the References Section.  It is Part B of the Guidebook for the Fieldtrip conducted for the 1995 Association of Engineering Geologists Annual Meeting in Sacramento CA.

Two Power Point slide shows of GSA Cordilleran Annual Meeting presentations now available for viewing in the documents section

The complete slide sets and slide notes for two oral presentations discussing the mineralogy and petrology of the auriferous gravels and their downstream equivalents are now posted in the documents section.

click here