From Scientific American...
........Now Curiosity has come across the ground-truth, including a rocky outcrop that is made of gravelly pebbles (clasts) cemented together into a crusty conglomerate. This is a chunk of up-tilted, uplifted ancient stream bed. The pebbles probably originated from the crater rim a few hundred meters higher up and their range of sizes, somewhat rounded shapes and placement all point towards their having been washed and rolled in water that was somewhere between ankle and hip deep.
Very cool stuff
........Now Curiosity has come across the ground-truth, including a rocky outcrop that is made of gravelly pebbles (clasts) cemented together into a crusty conglomerate. This is a chunk of up-tilted, uplifted ancient stream bed. The pebbles probably originated from the crater rim a few hundred meters higher up and their range of sizes, somewhat rounded shapes and placement all point towards their having been washed and rolled in water that was somewhere between ankle and hip deep.
Very cool stuff
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