Geology Home Page
Roger Weller, geology instructor
email@example.com copyright 2011-R.Weller
These structures most often occur in thin layers of shale; these structures are a
series of right circular cones developed one within the next and are caused by a
pressure solution process.
Photo is copyright free for
non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.
Specimen courtesy of
Yavapai Community College