I found a large snaping turtle laying eggs on a muddy bank of my pond about 2 weeks ago. She was about 19 lbs. Eggs were about the size you mentioned. The next day I found about 12 eggs that were dug up in good condition and about 5 shells of eggs that had been eaten. Two days before I found her laying eggs (by the way she seemed to be in a trance)I killed a 22 lb snapper. My pond was built Dec 2004 on a small stream. Must have come from an older lake about 600 yards above mine. I have the eggs in a coffee can of wet mud.