West Cornwall, Connecticut. This part of the Carse Brook swamp is an abandoned beaver pond that ha the brook running through the middle of it. Where Dave is standing on grass used to be under water when the beaver pond was active.
This is a depression in the old bottom of the Carse Brook beaver pond where water collected and froze. There are hundreds of these throughout this abandoned beaver pond, each with its own shape and crystal structure in the ice.
This is a closer shot of the ice formed in the depression in the bottom of this abandoned beaver pond.