IWLOP #123 - Mersenius & Rimae Mersenius

RI: Mersenius was oval shaped with a central uprise. There was a shallow shadow on the west side and slight evidence of one in the east. It had wide terraced and deep walls. Impact Crater H was on the SW wall and Crater P on the opposite side whose northern wall seemed to disappear into the adjacent 'plains'.
R2: Rimae Mersenius seemed like a wide "M" adjacent to Mersenius that followed the crater ridge and was almost parallel to the northern section of Rupes Liebig. The Rimae created shadows; the Rimae were not the same length and at the end near Crated D it appeared to have a higher wall that created larger shadows than the remaining sections.

NOTE: There was an illuminated semicircle east of Mersenius that broke half way up. I questioned whether the lower part was Rupes Liebig and whether the upper part was part of Rimae Mersenius.