When as glacier drags a stone across bedrock, that stone can dig in and slip, dig in and slip. This leaves distinctive marks on the bedrock. A cropped picture from that link:
If we could hear these stone slipping, and time were compressed, I presume, the stones would chatter. At Georgian Bay National Park, I saw such chatter marks.
And then two days later, I saw the same marks in an unlikely place:
Post a Comment