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An unconformity is a geologic feature that occurs when there is a break in deposition of rocks in a stratigraphic column. It indicates that the deposition was not consistent and there had been prior erosion on the older rock layer that is overlain by younger strata....
A metallogenic epoch isa period of time during which a significant concentration of deposits of one metal formed in one or more provinces. Metallogenic Provinces in relation to Plate Tectonic Setting. Interior Basins 1- Placer Gold deposits (e.g. Witwatersand) 2- Unconformity type U deposits (e...
The basement rocks of Indiana belong to the Eastern Granite-Rhyolite Province which is believed to be primarily anorogenic granite. The nature of the rocks that immediately overly basement is not well understood due to a paucity of data, although several deep wells have indicated the presence of ...
Farther north, incipient inversion accounts for the folding of the Albian unconformity, with zero displacement at the tip of the underlying Jurassic border fault (Fig. 8c). In contrast, oblique inversion becomes the dominant struc- tural style along the Icotea trend, in the north-central ...
The highest seismically recorded cuesta crest is in 440m of water and the islands and reefs are generally closely surrounded by water deeper than 1500m. Since the so-called Mid-Miocene Unconformity (MMU), the region has been undergoing post-rift thermal subsidence. However, the nearby seismic ...
Nevertheless sea-floor dissolution may have occurred, but the evidence removed when the rocks were subject to freshwater processes; the difficulty is proving dissolution of the sea floor under marine conditions. An additional problem is that each geographic area with records of the shallow-water ...
Emplacement of the Long Reach segment prior to Late Devonian time is suggested by an unconformity between granitoid rocks of the Lingley suite and the Devono-Carboniferous Sagwa conglomerate. Contrasting geology in the Pocologan River and Long Reach areas: implications for the New River belt and co...
A metallogenic epoch isa period of time during which a significant concentration of deposits of one metal formed in one or more provinces. Metallogenic Provinces in relation to Plate Tectonic Setting. Interior Basins 1- Placer Gold deposits (e.g. Witwatersand) 2- Unconformity type U deposits (...