NASA / JPL-CALTECH / UNIV. OF ARIZONA / SCIENCE PHOTO LIBRARY NASA / JPL-CALTECH / UNIV. OF ARIZONA / SCIENCE PHOTO LIBRARY
Chasma Boreale, Mars, satellite image. Chasma Boreale is a 560 km long valley that cuts through the Northern Polar layered deposits of Mars. The section that it exposes shows fine scaled layering and a major unconformity, where the azimuth of the bedrock changes markedly. This is characteristic of the polar layered deposits. The formation of the unconformity suggests a time when the lower sediments were being eroded rather than deposited. The extracted image shows a roughly 4 by 4 kilometre area across the unconformity. Imaged by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter (MRO) satellite.
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