HiRISE (NASA): Boulder Patterns

This image of a crater floor at high southern latitude reveals many boulders ranging from 1 to 10 meters in diameter. The boulders are not distributed randomly or uniformly but are often arranged in linear or circular patterns.

Black and white images are less than 5 km across; enhanced color images are 1 km. For full images including scale bars, visit the source link.

NASA/JPL-Caltech/UArizona