Spirit Rover Images of Martian Rocks (IMAGE) University of Arizona Caption These Spirit Rover camera images of the intercrater plain between Mars' Lahontan Crater show uniformly-spaced small rocks, known as clasts. The image on the left is a portion of NAVCAM image ID 2 N 137561115 EFF 47 00 P1827 L0 M1. The image on the right is a portion of Pancam image 2 P 137636467 EFF 47 DQ P2514 R1 C1. Credit Geological Society of America. Usage Restrictions This photo may only be used to illustrate a story about the research described in the accompanying news release, License Licensed content 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.