Where did the bulk of the placer gold in Tertiary river sediments in California come from?…maybe Nevada!

This paper further expounds on this alternative theory of the origin of California placer gold is available here.

Christensen, Odin D., Christopher D.Henry, and Jim Wood, 2015, Origin of gold in placer deposits of the Sierra Nevada Foothills, California, Geological Society of Nevada Symposium 2015.


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.

Narrative Posted to Accompany GSA Presentation: Geologic Hazards in the Early Tertiary Sediments of the Sierra Nevada Foothills of California

This is the narrative or notes to accompany the Power Point slide show: Geologic Hazards in the Early Tertiary Sediments of the Sierra Nevada Foothills of California 

view here

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

2013 GSA Cordilleran Conference presentations available for viewing in the documents section

Two oral and two poster session presentations made at the 2013 Cordilleran GSA Conference are available to view or download.  These are papers that focus on the nature of the Early Tertiary fluvial sediments and their role in geotechnical issues in the Sierra foothills and adjacent Sacramento Valley areas.

click here