California Geo-organizations

• San Diego Association of Geologists
• Fallbrook Gem and Mineral Society
• Geologic History of San Diego County (Mike Walawender)
• Geology of San Diego County (Tom Demere)
• California Geological Survey (formerly CDMG)
• AAPG Pacific Section
• Natural History Museum of Los Angeles County
• Page Museum - La Brea Tar Pits

General Geo-organizations

• Association of Earth Science Editors (I'm an officer)
• Geology News
• Earth Magazine (formerly GeoTimes) (RIP, May 2019)
• webGeology (Norway)
  Flash Animations Illustrating Various Geologic Principles
• American Geosciences Institute (AGI)
• Geological Society of America
• U.S. Geological Survey
• American Association of Petroleum Geologists
• The Field Museum of Natural History, Chicago
• Earth Science Week, 13 - 19 October
  2019 theme: "Geoscience Is for Everyone"
• Earth Science Picture of the Day
• INEGI
  (geographic, demographic and economic information of Mexico)

College Courses On-line

• List of Free Online Geology Courses
• Space Resources - University of Wisconsin
  Taught by the only geologist to have taken a field trip to the moon!
• Gems and Gem Materials, Jill Banfield, UC Berkeley

General Geology

• Notes on Planet Earth 3.0
  Dr. Gary Girty's E-book Plus... (SDSU)
• Geomorphology From Space (NASA/JPL)
• The Virtual Geosciences Professor
• A Geologist's Lifetime Field List
• Dr. Ron Blakey, Geology Professor, Northern Arizona University
• Bill Arnett's "Nine Planets" Page
  also check out his personal page at https://arnett.us.com/bill.html
• Geochemistry On the World Wide Web
• WebElements Periodic Table of the Elements

Rocks and Minerals

• Geokem - Igneous Geochemistry
• Athena Mineralogy; Pierre Perroud (Switzerland)
• MinDat.org
  STUNNING photos of mineral specimens!
• Amethyst Mineral Galleries
• The EUROMIN Project
• The Arkenstone Fine Mineral Specimens

Miscellany

• Minnesota Geological Survey
• Information Pages on Baja California
• New England Meteoritical Services

• Rise and Fall of San Diego: 150 Million Years of History Recorded in Sedimentary Rocks by Pat Abbott (1999)
• Geology of the Elsinore Fault Zone, San Diego Region: SDAG/SCGS Volume Number 31-2003 edited by Murbach & Hart (2003)
• Geology and History of Southeastern San Diego County, California: San Diego Association of Geologists Field Trip Guidebook for 2005 and 2006 edited by Bloom, Farquharson & Ziegler (2006)
• or better yet, go right to the source: SDAG Publications Page!
  (note that our publisher, Sunbelt Publications, is in El Cajon, and are open for business online and "storefront")