Tar Pit at Rancho La Brea (image) University of California - Riverside Caption A tar pit at Rancho La Brea. Pits like these have yielded thousands of animal fossils. Credit D. E. Crowley, UCR. Usage Restrictions None 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.