... on the assumption that the gravity anomalies reflect the buried features of the Precambrian basement, with density of 2.7 g/cm 3 as compared to an average of 1.9 g/cm 3 for the sedimentary cover. The Sargodha–Shah Kot ridge of the Punjab Plain is inferred to be a horstlike block of raised continental crust...

...) the Block Fault province characterized by north-northwest-trending growth faults coincident with the deltaic depocenter; and (4) the Monoclinal province, an area of regional north dip and sedimentary thickening from the Guayana shield into the deltaic depocenter. Oil production is associated...

...BRIAN HOWARD BAKER; JOHN GRAHAM MITCHELL Abstract An area 1360 km 2 in extent on the eastern side of the South Kenya rift valley consists of block faulted Plio-Pleistocene flood lavas ranging from basalts to trachytes. The oldest flood lavas are the Limuru trachytes (1.91 Ma BP) which were followed...

... of the Motagua fault zone through southern Guatemala, into a northwestern Maya block and a southeastern Chortis block ( Dengo, 1969 ). The Sierra de Omoa lies southeast of the Motagua fault zone on the Chortis block and the Caribbean plate ( Molnar and Sykes, 1969 ; Holcombe et al, 1973 ).This report shows...

...MAGNUS S. GARSON; MIROSLAV KRS Abstract Wilson's concept that transform faults were initiated along ancient fractures is supported by evidence from southeastern Egypt. Geophysical and geological investigations have outlined blocks bounded by transverse fractures oriented perpendicular to the Red...

...E. C. KALKANI; D. R. PITEAU Abstract This paper describes the results of a two-dimensional finite element analysis which was carried out to investigate the stability and related stress conditions of a toppling failure involving steeply dipping tabular and lenticular fault blocks above a cut bench...

...W. C. Barnes; J. V. Ross Abstract A large block of Upper Paleozoic limestone at Blind Creek near Keremeos, B.C. was emplaced by dry gravity sliding, probably associated with uplift related to nearby Eocene volcanism. The block is a nearly flat tabular unit, exposed over an area of 650 m by 1300 m...

...ROBERT C. MILICI Abstract Age relations of major Southern Appalachian structural blocks, as determined at their intersections, indicate that the older faults of the Alleghanian deformation are to the west and the younger ones are to the east toward the supposed direction of the deforming forces...

... Messaoud. The El Agreb–El Gassi structure is a northeast-southwest-trending anticline divided into separate blocks by northwest-southeast-trending faults. It is on the western side of the major ancient Hassi Messaoud anticlinorium which separates the Algerian Sahara into western and eastern basins...

...Donald W. Hyndman; James L. Talbot; Ronald B. Chase Abstract Rise of the Cordilleran infrastructure during the last half of Mesozoic time provided the gravity potential for lateral spreading and overthrust movements. Near the northeastern margin of the Idaho batholith a tectonic block, 100 by 75 km...

... during a tectonically quiescent period. Pliocene time marked the onset of block-faulting activity which fragmented the crust into irregular ridges and basins in northern Central America and along the Honduras continental margin and the western Cayman Trough. The continental shelf and slope of Honduras...

.... The sequence has been disrupted into five structural blocks separated by fault zones containing serpentinized peridotite and/or talc-carbonate; units within each block are separated by less significant faults. These structures and other deformation features in the Baie Verte Group are interpreted to be related...

...M. D. Max; R. P. Riddihough Abstract A major geophysical lineament in Ireland is correlated with the Highland Boundary fault in Scotland; it is shown to separate a southern block, deformed in Middle to Late Cambrian time, from a northern block that was deformed in early Ordovician time...

...Robert C. Milici; A. R. Leamon Abstract Three thrust blocks, which represent the broken elements of a once continuous thrust sheet, can be used as a model to explain the general structure, sequence of thrusting, and mechanics of thin-skinned tectonics along much of the Allegheny structural front...

...Harold E. Kellogg Abstract An arm of the North Atlantic seaway reached Svalbard during the Paleocene, either in advance of, or in response to, early drift of Greenland away from the Eurasian continental block. Initial Tertiary sediments in Svalbard were marine, littoral, and paludal clastics...

...David K. Rea Abstract The topography of the East Pacific Rise axis is characterized by a central axial block 300 to 400 m high and 15 to 20 km wide. The axial block is flanked by asymmetrical abyssal hills tilted so that their steep slopes face the axis. Extrusion of basalt along the spreading...