The anomalous central Utah record appears to have been profoundly influenced by a massive salient (Nebo-Charleston thrust system) in the Sevier Fold and Thrust belt that was active for much of the Late Cretaceous.
Within the Wyoming salient of the Sevier belt, major thrust and fold traces display systematic map-view curvature about an average N S structural trend, reflecting a component of primary curvature related to sedimentary prism architecture, followed by 60 80% vertical-axis rotation of thrust sheets related to curved fault slip and interaction with Laramide arches at the salient ends.
Meanwhile, the French had retaken Montdidier and were thrusting toward Lassigny (between Roye and Noyon); and on August 17 they began a new drive from the Compiègne salient south of Noyon.
On August 20, however, two Soviet thrusts were launched in another direction against the German salient in Bessarabia.
Located in the external sector of the thin-skinned Brasília foreland fold-thrust belt, the ca. 130 km long and 80 km wide Três Marias salient involves the up to 2500 m-thick Ediacaran Bambuí sequence.
In order to characterize the overall architecture and processes involved in the generation of the Três Marias salient, we conducted a detailed structural investigation of the southern segment of the Brasília foreland fold-thrust belt, based on surface, seismic, well and aerogeophysical data interpretation.
The salient is frankly dominated by monotonous trains of upright chevron folds, bounded by a small number west-dipping thrust faults.
We first used field observations and fold-thrust belt concepts to re-interpret thrust nomenclature and geometry in the recess by correlating structures and lithology with the adjacent Dharan salient across the salient-recess separating Gish Transverse fault (GTF) and renamed the locally recognized faults to their regional equivalents.
The structural traces of thrusts and fold hinges on maps trend preferentially NS in the central portion of the salient, curving progressively toward NE and NW in its southern and northern limbs, respectively.
It is suggested that the salient structural features of the eastern fold belt, e.g. multiphase fold development, series of east-dipping thrusts and a basal zone of detachment or decollement, are the products of thin-skinned tectonics resulting from the Indo-Burmese plate convergence.
