Re: Nilosyrtis, Dao, and Harmakhis
Nilosyrtis and Dao have caught my attention before. Thanks for the pictures.
Check out the large crater at the top of this Nilosyrtis Mensae region the picture (I wish I remembered the HTML code to post a picture here);
http://www.msss.com/moc_gallery/m07_m12/images/M08/M0802185.html
This crater has very smooth walls. It does not look like rock, it looks like ice. I can also see layering like we would see in glaciers.
As a amature (Once professional) geologist, I see craters as a tool for exposing what is under the surface.