Rock Dunder and much larger nearby Juniper Island (visible in the background of the picture) are remnants of a large belt of Utica slate which once filled Lake Champlain from Shelburne to South Hero, part of a belt extending northward from the Hudson River.
The base of the rock is strewn with large boulders of Winooski limestone and Laurentian gneiss.
As he dragged his body around, he created mountains, valleys and rivers, as well as Lake Champlain, which is holy to the Abenaki.
[2] An 1896 newspaper article says the Huron and Iroquois would meet here at what they called Wujahose to make their treaties.
At the height of the Battle of Plattsburgh the patriots put a lantern on the rock which was shrouded in fog, to make it look like one of their ships.