Rock nerds rejoice! From big boulders to tiny pebbles, the ancient riverbed I’m exploring right now has it all. Washed in from upstream, these fragments can help my team uncover the river’s past and its potential for supporting ancient life. Read more: https://t.co/s0hgK7rOKp pic.twitter.com/FDnzZz4eF3

— NASA's Perseverance Mars Rover (@NASAPersevere) July 19, 2023