Saw a huge non-snapping turtle laying eggs by Phairs Pond the other day, and saw two more (above) laying eggs in the yard yesterday morning.
The first one was so large that I could not find anything large enough for a size comparison. It was a good 10 inches. (A quarter or nickel would not do the job.)
If you're driving near the CF, look out for these guys. I think they are native Eastern Painted Turtles. More about NJ turtles here.