which is older, a fossil in a sedimentary rock layer at the bottom of a canyon or a fossil in a sedimentary rock layer at the top of a canyon? explain
The fossil at the bottom is older. You can tell this because the sedimentary rock at the top would on been created after the sedimentary rock at the bottom. It seems like the one at the bottom because once it forms at the top its more fresh and at the bottom, its been there longer.