Thermal, chemical, alternating field (AF) and two-stage (AF followed by thermal) experiments were performed on 18 sites (217 specimens) of three sedimentary units (groups A, B and C) of the Mascarene Group of southwestern New Brunswick. Groups A and B of Pembroke age (late Late Silurian) apparently carry a dual polarity initial remanence yielding a pole at 087⊕ E,05⊕ S. Group of C of probably Waweig age (older than Pembroke) carries a magnetite remanence and a hematite remanence with the former probably being the intial and yielding a pole at 085⊕ E, 28⊕ N. This would indicate a pole shift of some 30⊕ southwards relative to the sampling area during the Upper Silurian, in agreement with the hypothesis that considerable polar shift took place during the Siluro-Devonian period. The extensive experimental work (over 4000 treatments) demonstrates the need to use several techniques in the pursuit of the magnetic history of the rock. For example, if the work had been limited to thermal treatment up to 650⊕ C, an overprinted or more likely an apparent remanence could conceivably have been mistaken for the intial remanence. Conversely, the considerable information gathered through the use of different techniques allows one to advance and model the most probable scenario of remanence acquistion while contributing additional knowledge about the magnetic characteristics of sedimentary units. Results from this investigation, including those of a Mascarene Group intrusion also reported here, are discussed in the context of Siluro- Devonian poles of North America. Different options are open to the interpreter attesting to the difficulties in establishing both the rock and remanence ages. It is concluded that more data from detailed investigations are needed before the evolution of the eastern seaboard and the Appalachians can be retraced by paleomagnetic means.