🦇 Going Batty #14 🦇 Mystery Cache

GOING BATTY #14

Welcome to my new Bat caches.  When I lived in Missouri during the summer of 2003, I worked at Ozark Caverns within Lake of The Ozarks State Park. Ozark Caverns has remained mostly natural as there is no lighting installed in the caves, which makes it a great habitat for bats.  I learned quite a bit about bats and wanted to create a few bat puzzle caches: the "Bump In The Night" for Snag The Tag is the perfect time to do it too.  

The cache is not at the posted coordinates.

Bat Fact #14

Evolutionary Origin of Bats

Bat skeletons are small and light, and as a result do not fossilize easily. There is therefore relatively little fossil evidence of early bats. Not much is known about their evolutionary history and how an early, four-legged terrestrial mammal evolved wings and the ability to fly.

Puzzle:

The oldest-known bat species is Icaronycteris index. A complete fossil of this early bat was found in the Green River formation of what U.S. State?

Click on Certitude below to enter your answer, to get the final Cache Coordinates and Hint.

You can validate your puzzle solution with certitude.