Syria Planum-centered volcanism and tectonism produced fractures, narrow to broad grabens, large scarps, and broad fold and thrust ridges that deformed a basement complex. Picture is centered at latitude 29 degrees S., longitude 101 degree W. The region appears to have been mantled by materials of unknown origin. Colors seen in the enhanced color version (PIA00154) are due to variable proportions of dust and sand and possibly to different kinds of weathering or alterations. Viking Orbiter Picture Numbers 421A42 (violet), 421A48 (green), and 421A50 (red) at 106 m/pixel resolution. Picture width is 117 km. North is 101 degree clockwise from top.