NASA's Mars Global Surveyor shows martian polar layered deposits taken in July 1998 exhibiting features common to sedimentary rocks on Earth. At left, an angular unconformity, with horizontal layers overlying tilted beds; at right: deformed layers.

The martian polar layered deposits exhibit features common to sedimentary rocks on Earth. The image on the left shows an angular unconformity, with horizontal layers overlying tilted beds. The image on the right shows deformed layers. Both pictures were taken on MGS's 445th orbit about the planet in July 1998.

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