the darker parts at the top is were the sandy soil has a higher cositency of soil and clay in it which is what makes it darker and also the side at the top where the grass has supposedly grown back fromm some body elses dig would that not be mounded up from the soil that had already been dug out if that is the case instead of it geing perfectly level to the rest of the ground plus at the top off the dig you can still see the grass and bramble roots that we had cut threw the little whispery ones which would of died out and floped down if it was a old dig. i cant understand why a genuine dog lad