Answer:
yes the asthenosphere can break
The answer is Gully Erosion. It is known as the least common yet would cause the most dramatic visible change in the landscape. The cuts that are deep in the soil would leave large gullies that would expand through erosion.
I assume that it's a hominid fossil - since it has tools and mostly only hominids are found to use tools (although birds are also known to use tools).
It could be Homo erectus, which lived between 2 million years ago and 70 000 years ago, but more likely it's homo habilis, which lived from 2.5-1.5 million years ago.
