LIDAR and other evidence for the southwest continuation and Late Quaternary reactivation of the Norumbega Fault System and a cross-cutting structure near Biddeford, Maine, USA Ronald T . Marple1 and James D. Hurd, Jr .2 1. 403 Wickersham Avenue, Fort Benning, Georgia 31905, USA 2. Department of Natural Resources and the Environment, The University of Connecticut, 1376 Storrs Road, Storrs, Connecticut 06269-4087, USA Corresponding author <
[email protected]> Date received: 14 April 2019 ¶ Date accepted: 01 September 2019 ABSTRACT High-resolution LiDAR (light detection and ranging) images reveal numerous NE-SW-trending geomorphic lineaments that may represent the southwest continuation of the Norumbega fault system (NFS) along a broad, 30- to 50-km-wide zone of brittle faults that continues at least 100 km across southern Maine and southeastern New Hampshire. These lineaments are characterized by linear depressions and valleys, linear drainage patterns, abrupt bends in rivers, and linear scarps. The Nonesuch River, South Portland, and Mackworth faults of the NFS appear to continue up to 100 km southwest of the Saco River along prominent but discontinuous LiDAR lineaments. Southeast-facing scarps that cross drumlins along some of the lineaments in southern Maine suggest that late Quaternary displacements have occurred along these lineaments. Several NW-SE-trending geomorphic features and geophysical lineaments near Biddeford, Maine, may represent a 30-km-long, NW-SE-trending structure that crosses part of the NFS. Brittle NW- SE-trending, pre-Triassic faults in the Kittery Formation at Biddeford Pool, Maine, support this hypothesis. RÉSUMÉ Des images haute résolution prises par LiDAR (détection et télémétrie par ondes lumineuses) dévoilent de nombreux linéaments orientés du NE vers le SO qui pourraient représenter la continuité au sud-ouest du système de failles de Norumbega (SFN) le long d’une vaste zone de 30 à 50 km de largeur de failles cassantes qui se poursuit sur au moins 100 km à travers le sud du Maine et le sud-est du New Hampshire.