Inkwell Ideas Geomorph Map Contest #2 (2nd entry)

Inkwell Ideas has kicked off a second contest (http://inkwellideas.com/2015/04/geomorph-map-contest-2 ) whose theme is lava. (Entries due by May 5th.)

This geomorph shows a set of stairs descending into a chamber whose bottom is filled with mostly encrusted lava except for a small circular area used for some purpose, where the lava has not cooled.