Hooray for Glatt... I sort of figured he would be the one who got it !
Here are 2 links to sort of justify my hints...
19 different surfaces, named for Egyptian cities - this one is the most informative
Rosetta data deluge reveals dynamic comet with sand dunes and jets
This is a link to the "crack"
Rosetta images reveal crack hundreds of meters long in comet 67P
I do admit to cropping and flipping the pic in several modes to make Google Image searches more difficult.