Mercury - Mariner 10

Scarp Features in Tir Planitia, Mercury

Mercury
Mariner 10 image showing scarps in the southeast Tir Planitia region of Mercury. These scarps may be volcanic flow features or compressional faults. This image was taken during the first flyby. North is up, and the scarps trend from southwest to northeast. The frame is about 130 km across. (Mariner 10, Atlas of Mercury, Fig. 8-10) 

Mercury 
Mercury: Geology 
Impact Cratering
Volcanism in the Solar System