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.

Tuck their feet up along side their body, expel air from their lungs and maneuver with their tail only.

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. :)

The Strait of Separation The Strait of North/South The Strait of Christchurch The Strait of HMS Bounty The Strait of Australia The Strait of ... How can you tell I have no idea and am just guessing. Now, I'm going to look it up.