The Dover fault

The Fault forms a tectonic boundary between northern portions of the Gander and Avalon Zones of the Newfoundland Appalachians.

It's one of the most important geological structures in understanding Newfoundland's geology and evolution of the Appalachain Mountains. It can be traced throughout the island, and geophysical surveys across the fault indicate that it is a fundamental structure that extends downward for tens of kilometers, transecting the full thickness of the crust. The surface expression of this great break is well developed in its namesake, the Town of Dover