Oyster Boulder (image) University of California - Davis Share Print E-Mail Caption A boulder of native oysters near Tomales Bay, California. Credit Courtesy Ted Grosholz, UC Davis Usage Restrictions Provide credit. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.