Multichannel seismic reflection profiles of the continental crust beneath the Newfoundland Ridge

Magnetic Anomalies and Seafloor Spreading in the Western North Atlantic, and a Revised Calibration of the Keathly (M) Geomagnetic Reversal Chronology

“…old rather than 135 m.y. As previously dis¬ cussed, the basement age at Site 384, together with other data, casts doubt on the hypothesis that the /-anomaly ridge is a sliver of continental crust (Gradstein et al, 1977;Grant, 1977). The Site 384 basement age also appears to rule out a suggestion made by some authors (e.g., Barrett and Keen, 1976) that the /-anomaly ridge lies in the middle of the Keathley se¬ quence.…”

“…The age and composition of Site 384 basement ba¬ salt, together with magnetic anomaly data and geomet¬ ric considerations, lead us to reject the suggestion of Gradstein et al (1977) and Grant (1977) that the /-anomaly ridge is a sliver of continental crust (see also Tucholke and Vogt, this volume).…”

A Seismic Comparison of the Early Stratigraphic Evolution of Conjugate Passive Continental Margins: The Newfoundland/Flemish Basin and the Eastern Iberian Abyssal Plain South of Galicia Bank

“…The U unconformity, previously identified on the Grand Banks (Amoco and Imperial, 1973;Grant, 1977) and recently carried seaward into the Newfoundland/Flemish Basin (Meador et al, 1985, in press), correlates in both age and seismic signa ture with the Formation 3/Formation 4 sequence boundary south of Galicia Bank (Group Galice, 1979). The U unconformity ap pears to form the upper Lower Cretaceous rift/drift transition in the Newfoundland/Flemish Basin, as does the Formation 3/ Formation 4 boundary west of Iberia (Boillot, Winterer, et al, 1987).…”

“…6). On NB-2 at the Skua E-41 well, Meador et al (in press) have correlated this reflector to an unconformity of late Early Cretaceous age, which has been observed elsewhere on the Grand Banks and termed the "U" unconformity (Amoco and Imperial, 1973;Grant, 1977). Meador et al (1985, in press) have traced the U uncon formity from the Skua E-41 well site across the shelf and slope to the northern part of the deep Newfoundland Basin, where it pinches out at the morphologic transition in acoustic basement associated with the J anomaly (Fig.…”

Magnetic fabric analysis of sediments from the Côte d'Ivoire-Ghana Transform Margin

“…Such formations include the Newfoundland Ridge (Grant, 1977), the Ivory Coast-Ghana margin (Mascle and Blarez, 1987), the Oman margin (Barton et al, 1990), and the Exmouth Plateau (Lorenzo et al, 1991). The marginal ridges result from a strike-slip shearing along the transform seafloor spreading direction.…”