There are fossils in every layer of the quarry, but the big fossil clams with calcite occur only in one layer. Here's a group of people working along the bank of the quarry looking for the clams. They're all working the same horizontal layer about one third of the way up. Eddie used to let people dig in the quarry itself, but now he scoops up huge piles of the rock and dumps them on the side of the quarry (for *sigh* liablity reasons).