“…It can be traced laterally for 600 km before terminating against or merging with the East Coast Magnetic Anomaly (ECMA), which is a 48-km-wide, through going magnetic high along the rifted Atlantic margin of Laurentia (e.g., Vogt, 1986;Klitgord and Schouten, 1986, and references therein). The ECMA, which can be traced for more than 3000 km, has been interpreted variously: as an edge effect; as a dike suite; as a series of seaward-dipping reflectors containing tilted basalt flows; and as a deep-seated mafic intrusion (e.g., Alsop and Talwani, 1984;Keen, 1969;Keller et al, 1954;Oh et al, 1995) along or near the continent-ocean transition (Vogt, 1973;Vogt and Einwich, 1979)) Nelson et al (1985a,b) and McBride and Nelson (1988) suggested the ECMA may represent a Paleozoic suture. Thus the ECMA was probably emplaced 175-190 Ma (Vogt and Einwich, 1979;Klitgord and Grow, 1980;Sheridan, 1983;Alsop and Talwani, 1984) possibly along or near the relict suture during early rifting leading to successful opening of the Atlantic Ocean.…”