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  • Pennsylvania Jackfork Group Analysis

    Introduction The Pennsylvania Jackfork Group is located in the Ouachita Mountains, occupying Arkansas and Oklahoma. Several authors interpreted the Pennsylvania Jackfork Group as a classic flysch sequence in a submarine fan setting, dominated by turbidites. Shanmugam and Moiola (1995) reveal contrary evidence for the origin of these beds. They interpret the origin of these beds to be from debris-flow, slump, and bottom-current because slabbed samples from sedimentary features appear “massive” in outcrop, thin sections show variation in vertical grain size, individual units contained in the matrix, and the use of the term “turbidite” in relationship to process sedimentology. The purpose of this paper was to create a depositional model for…

    Words: 1460 - Pages: 6
  • Great Valley Sequence

    By dating ammonite fossils, we know that the Panoche Formation (Mid-Cretaceous) is older than the Moreno formation. The conglomerates’ clasts have sizes around 5cm in diameter and they are round to sub-angular. Mineralogy of the clasts includes slightly metamorphosed felsic extrusive igneous rocks (rhyolite to dacite), metamorphic rocks (quartzite) that have high T/P ratios, greywacke, and chert. The source of the clasts might be a continental crust. The Panoche Formation was part of the…

    Words: 717 - Pages: 3
  • The Importance Of Existance Of Lake Malawi

    with the north part characterised by lacustrine sediments consisting of sandstone and mudstone are interbedded with clastic rocks and volcanic rocks for example Rungwe volcanic shown in figure 2.2 (Ebinger, 1989). According to (Crossley, 1984) initial rifting started during Miocene age with earliest Cenozoic deposits ( figure 2.2 ) of lacustrine sediments occurring at the same time and initial subsidence of the rift during Pliocene age. The geological age present includes Cretaceous, Neogene,…

    Words: 1311 - Pages: 6
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