The horseshoe-shaped, limestone cliffs above the basin at Clark Reservation were created about 10,000 years ago, when the mile-thick glacier that stretched from Pennsylvania to Canada started its retreat. As it receded, meltwater carved out Clark Reservation, most notably the glacial plunge pool basin that contains the lake.
The lake (Glacier or Green lake) is 10 acres in size and 62 feet (20 m) deep. It is one of the few meromictic lakes in the US. The surrounding limestone cliffs are 180 feet (60 m) high.
Around 10,000 years ago, toward the end of Wisconsin glaciation, the retreating ice sheet blocked the northern ends of the Onondaga and Butternut Valley, forming long glacier lakes. The waterfall was formed when the glacier lake in the current Valley area south of Syracuse drained eastward to the Butternut valley. Geologists believe the waterfall lasted for 2,000 years and was greater in volume than the American falls at Niagara!
When the ice retreated further northward, a lower-lying channel (Rock-cut channel) was carved where Interstate Route 481 is currently located. This led the water flow to cease through Clark Reservation.
To claim a find for this cache, please read the sign at the posted coordinates and:
1) email or mesage us the four factors that cause Glacier (or Green) Lake to be meromictic, as listed on the sign. Please send the email or message before or immediately after logging the cache. In fairness to others, your log will be deleted if we don't receive the required information when we receive your log. You should not expect us to remind or pursue you for the required information.
2) Post a picture of yourself (or your GPSr, if you’re alone) with Glacier/Green Lake in the background. You can obtain a picture near the posted coordinates (the only option during winter), or at the shore of the Lake (accessed via the stairway to your right), or along the Cliff trail (follow the fence to your left).
Sorry, but logs posted that do not meet the above requirements will be deleted.
There are five geocaches at Clark Reservation – if you want to find them all in one day, allow a couple of hours and be sure to print the trail map attached to this cache as a photo
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 Permit #Cr-01-2014
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