Lockyer (Moon)

Named after Sir Joseph Norman Lockyer - British astrophysicist (1836-1920).

Lockyer is fairly easy to spot on Mars maps because it sits in the young northern hemisphere, where there are few craters. It is close to Elysium Mons and Hecates Tholus, two large volcanoes. Impact craters generally have a rim with ejecta around them, in contrast volcanic craters usually do not have a rim or ejecta deposits. (wikipedia entry)

A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.