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Terby is a crater on the northern edge of Hellas Planitia, Mars. It is in the Iapygia quadrangle. The 174-kilometre-diameter (108 mi) crater is centered at 28°S, 73°E with an elevation of −5 km (−3.1 mi). It is named after François J. Terby. It is the site of an ancient lakebed and has clay deposits.

Terby ( crater )

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Terby Crater

Bedrock North of Terby Crater

This image samples the excellent bedrock exposures north of Terby Crater, which lies on the northern rim of the giant Hellas basin.