TODAY'S THEMIS IMAGE: Dramatically shaded highlands in Terra Cimmeria:

This image shows the cratered highlands of Terra Cimmeria. The image contains several long troughs of Sirenum Fossae running primarily from left to right. These features are parallel to semi-parallel fractures called graben. In places the fractures postdate crater formation. This is best seen where fractures cut across the ejecta blanket of the large crater near the right center of the image.