Geologic Map of Mars (IMAGE) American Geophysical Union Caption This is a geologic map of Mars. Colors show distribution of 44 map units (Robinson projection, Mars Orbiter Laser Altimeter (MOLA) shaded-relief background). For example, greens represent mainly lowland and basin units; yellow is relatively young impact material; reds and purples are volcanic units; blues are polar units; and earth tones are apron, transition, and highland units. Credit Adapted from Tanaka et al. [2014] Usage Restrictions None 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.