The recent availability of high-resolution light detection and ranging (LiDAR) data in Connecticut has led to the discovery of a 125-km-long, northeast-trending geomorphic lineament, herein named the Eastford lineament, in eastern Connecticut and south-central Massachusetts. It appears to represent a surface expression of the 50-km-long Eastford fault that continues to the northeast and southwest. The proposed fault zone appears to be post-Triassic in age, since the Eastford fault and other shorter mapped faults along the lineament offset the ~201-m.y.-old Higganum dike system and Paleozoic lithotectonic terranes and structures. An integration of borehole data from the Moodus Deep Well, the 1987...