THE CHAMPLAIN THRUST FAULT
A thrust fault has the same sense of motion as a reverse fault, but there is movement in which rocks of a lower stratigraphic position are pushed up and over higher strata. This places older rocks above younger rocks.
(Modified from http://homepage.ufp.pt/)
Estimates of displacement along the thrust based upon seismic reflection studies, calculations of the fault dip and stratigraphic throw (vertical distance), and tectonic considerations are in the order of 35 to 50, and possibly up to 62 miles. Amazingly, displacement of the dolostones may have originated in