Eden, NY (WGRZ) – A mystery of sorts has unfolded in an Eden, N.Y., backyard. It happened Friday evening as Peggy Gervase was looking out from the deck of her home at a nearby pond.

She spotted what appeared to be a series of concentric circles that had opened in the snow covering the pond. It almost resembled the unusual phenomena known as crop circles. But again this occurred on the surface of a pond.

Gervase posted pictures on Facebook and with a link on the WGRZ Facebook page, there were nearly 40,000 views with more than 200 comments. They contained explanations of what may have caused it. They included everything from underground springs to melting ice, meteors, methane gas, gas expelled by fish and ducks, and of course aliens.

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