My guess is fossils I realized you didn't say which city had the largest %, and I tried to pick a small state, but boy was I wrong! That's the larger state we have!!!! I was way off in my thinking.

Under chickens ... ... that have been sitting for quite a spell? o j

hmmm..... total WAG here... I'll guess a dime is about 1/2" diameter, and a quarter is about 1" diameter, and figure the grooves are about 1/32" apart, so my guesses are: dime => (.5 * 3.14) * 32 = 48-50 grooves quarter => (1.0 * 3.14) * 32 = 96-100 grooves with the variation being whether they groove them based on a decimal or binary system. :)

party planner Ok, I'll guess (for real)---cement contractor