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Sierra Geology

where rocks meet the human environment (or vice versa)

Sierra Geology

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    • 2013 GSA Cordilleran Conference Presentations
      • Early Tertiary Climate Change and its Impact on the Matrix Mineralogy of “auriferous gravels” in the Sierra Nevada Foothills
      • The Nature of Early Tertiary Soils and Sediments — Mineralogy and Petrology
      • Geologic Hazards in the Early Tertiary Sediments of the Sierra Nevada Foothills of California
      • Landslide Hazards Along the Interstate 80 Corridor Associated with the Early Oligocene Sedimentary and Volcanic Deposits in the Sierra Nevada
    • References
      • The Upper Reaches of the Sierra Nevada Auriferous Gold Channels
      • Geology of the Ione Formation in the Ione Area
      • A Historical Review Of The Age Assignments Applied To The Chalk Bluff Fossil Plant Assemblage, Central Sierra Nevada
      • Gold Bearing Gravels of the Ancestral Yuba River, Sierra Nevada
      • Re-evaluation of the origin of kaolinite in the Ione Formation
      • Geology and Ceramic Properties of the Ione Formation, Buena Vista Area
      • A Middle Eocene Flora From The Central Sierra Nevada
      • Origin of gold in placer deposits of the Sierra Nevada Foothills, California
      • The Ione Formation of California
    • Geologic hazards associated with Eocene and Oligocene Sedimentary Units in the Sierra Nevada Foothills
      • CGS Geologic Hazard Notice — Smectitic Sediments
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Tag Archives: Late Eocene climate change

A Historical Review Of The Age Assignments Applied To The Chalk Bluff Fossil Plant Assemblage

Posted on August 1, 2013 by James Wood

A new unpublished document by Howard Schorn is now posted  view here

Posted in Early Tertiary References, Late Eocene climate change | Tagged bench gravels, Early Tertiary auriferous gravels, Eocene flora, Late Eocene climate change, upper gravels

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

Posted on July 15, 2013 by James Wood

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

Posted in Early Tertiary auriferous gravels, Early Tertiary References, Late Eocene climate change, Oxisols | Tagged bench gravels, detrital clay clasts, Early Tertiary auriferous gravels, Early Tertiary Oxisols, Eocene kaolinite, Eocene Oxisol, Ione Formation, Ione Formation kaolinite, Late Eocene climate change, Late Eocene smectite, lower gravels, pedarenite, pedogenic silica cement, upper gravels

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