...MICHAEL J. P. WELLAND; A.H.G. MITCHELL Abstract The tectonic succession of the Oman Mountains, including the Semail ophiolite complex, resembles that underlying the Zagros thrust zone of Iran. Palinspastic reconstruction of the Oman sequence indicates a Triassic continental-margin–ocean-basin...

... phases of deformation of probable Mesozoic age are exposed at Old Dad Mountain. An important unconformity gives evidence of Late Triassic and (or) Early Jurassic unrest, and a thrust fault of this age may underlie Old Dad Mountain. A younger northwest-trending shear zone appears to have accommodated...

... to the north-northeast. Near the western end of the Brockman Hills the Mojado Formation and limestones of the Permian-Pennsylvanian Horquilla Formation have been thrust to the north-northeast over andesite of the lower Tertiary Hidalgo Formation. The Horquilla Formation is exposed as two small klippen...

...M. L. Bregman Abstract The western limit of the belt of Lara-mide thrusting in northwestern Montana is delineated by the Lewis-Eldorado-Lombard thrust faults. Within the Sheep Creek 7½-min quadrangle, the tectonic style of this belt changes from a moderately dipping zone of imbricated thrusts...

...MICHAEL A. NAYLOR; TIMOTHY J. HARLE Abstract The Vourinos ophiolite was thrust on to a SW-dipping sedimentary sequence comprising thick Triassic-Jurassic marbles (platform carbonates) overlain by the late Jurassic Ayios Nicolaos Complex. The sedimentary sequence was deformed and metamorphosed...

...-standing, relatively undeformed block northeast of the fault zone; (2) a 1.5 km-wide zone of folded sedimentary rocks between the two faults; and (3) a sparsely exposed, deeply down-faulted block on the southwest. Locally the two faults branch upward and flatten abruptly outward into low-angle thrusts...

...D. S. Brumbaugh; H. W. Dresser ABSTRACT The Sandy Hollow thrust fault of southwestern Montana is a Laramide overthrust that possesses an unusually well-exposed step. In the step zone folding, fault-transported slices, splinter faults, and decollement have resulted from fault movement. The wide...

... the Peel thrust fault, a structure separating shelf sedimentary rocks from paleozoic cherts, argillites, and metabasites. The Mooki anomaly occurs along the boundary of the shelf and terrestrial sediments where these strata are thrust against flat-lying Permian strata. The source of the Mooki anomaly...

... (by gravity tectonic denudation) as the western Piedmont-eastern Blue Ridge was tilted gently to the northwest during the Alleghany orogeny, probably during the Permian Period. In a later phase of the Alleghany deformation, the Blue Ridge anticlinorium formed, and throughout much of its length it was thrust...

... now be identified and compared with tectonic events recorded in the Scourian complex to the south. The following sections describe the structures dating from these early stages and deal with the manner in which they were modi- fied. 2. Early Scourian structures (A) THE EVIDENCE FOR EARLY THRUSTING...

...JAMES E. YORK; JACK E. OLIVER Abstract Cretaceous and Cenozoic faults in eastern North America provide evidence of modest intraplate tectonic activity in this region. Thrust and gravity faults are found; strike-slip movement is not demonstrable but could have occurred in some cases. Fault movements...

...B. D. Stone Abstract Slumped glacial delta sands and silts exhibit flexural slip folds and low-angle thrust faults where the beds remained coherent during slump deformation. Alternating cross-cutting relationships between f (sub l ) and f (sub r ) fold axial planes indicate that these fold groups...

.... The Doonerak anticline is bounded on both the north and south by faults that can be interpreted in at least two ways. A structural-window hypothesis postulates that the two faults are actually parts of the same fault and reflect long-range thrusting from south to north over the Doonerak high. This fault would...

... appears to be a southwestward-dipping fault zone along which the Pan-African age province was thrust over the Liberian age province in late Precambrian or early Paleozoic time. The formation at Gibi Mountain, consisting of arkose, shale, and conglomerate, is similar to units in the Rokel River Group...

...John S. Myers Abstract Archean gneisses in part of West Greenland mainly formed from sheets of tonalite and granodiorite emplaced into more mafic volcanic and plutonic rocks. Sheet emplacement was syntectonic and associated with dilation and thrusting, and it led to considerable and irreversible...