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.


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.

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