Download Ancient Seismites (GSA Special Paper 359) by Frank R. Ettensohn, Nicholas Rast, Carlton Elliot Brett PDF

By Frank R. Ettensohn, Nicholas Rast, Carlton Elliot Brett

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Extra resources for Ancient Seismites (GSA Special Paper 359)

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1982). Thus, the ages of Quaternary sediments in this basin must be inferred from paleosols, fossils, and depositional environments. This Quaternary basin is flanked to the north by the late Pliocene age Huckleberry Ridge Tuff, early Tertiary age gravels, and Cretaceous sedimentary rocks. The Centennial fault bounds the southern side of both the Centennial Valley and Henrys Lake (Witkind, 1972, 1975). South of this fault, the Centennial Mountains also contain Huckleberry Ridge Tuff in addition to Cretaceous to Paleozoic sedimentary rocks.

Below the ground surface at that time. This 2-cm-thick mediumto coarse-grained sand bed was the basal sand above a more clayrich unit. The basal part of the channel sequence that is above clastic dike 1, which previously disrupted and exposed this sand source bed, was deposited unconformably over the bed and is believed to have “sealed” it, so that overpressuring was possible during the younger event represented by clastic dikes 2 and 3. Clastic dikes 2 and 3 represent the model for development of clastic dikes in this area.

Northwest-trending faults such as the Red Rock and Lost River faults (Fig. , 1985; Stein and Barrientos, 1985), which is associated with the Basin and Range stress field (Stickney and Bartholomew, 1987b). Others, such as the Centennial fault (Witkind, 1975) (Figs. , 1993). Still other faults, such as the Lima Reservoir fault (Figs. 1, 2, and 3) discussed herein, have intermediate orientations not clearly characteristic of either stress field. As Sibson (1990) pointed out, however, faults can be easily reactivated if they are either favorably or unfavorably oriented relative to the stress field.

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