Sedimentary Structures
Cochise College        
Photos of Rocks         Sedimentary Rocks
Virtual Geology Museum       Hall of Rocks

Geology Home Page              

Roger Weller, geology instructor

wellerr@cochise.edu    copyright 2011-R.Weller

tool marks-B
closer view
Tool mark are scratches on stream bed made by moving sticks or rocks.
In this case, these are the casts of scratches.

tool marks                                                                                                                                         0457

Photo is copyright free for non-commercial educational uses. 
Just credit photo to R.Weller/Cochise College.