How does gravel pits form?

Question

How does the hill of gravel get there while all around is dirt. Did they come from the glaciers period?

Answer 1

Yes, glaciers push rocks along beneath them. the rock accumulate and are deposited as the glaciers melt.

Answer 2

The gravel was probably dumped there by a lorry driver.

Some of it would have been heaped up into a mound by a worker with his square mouthed shovel probably being paid a pittance by some fat cat somewhere.