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The geology of the Pearl River Delta is rock sequences plus superficial sediments, emplaced in an alluvial delta, occupying the Pearl River Estuary. The unconsolidated sediments which dominate the delta are largely derived from continental materials exposed across the Pearl River basin, and range in size from fine particles such as mud to larger fragments like gravel.
Canada The Munising Group or Formation is a 1,700 feet (520 m) thick, white to light grey [ 1 ] Cambrian sedimentary unit that crops out in Michigan and (to a lesser extent) Ontario . At one end of its extent, it comprises a basal conglomerate overlain by the Chapel Rock Member and the Miners Castle Member; elsewhere, it comprises the Eau ...
Pages in category "Deltaic deposits" The following 112 pages are in this category, out of 112 total. This list may not reflect recent changes. A. Abrahamskraal Formation;
The environment of deposition for these sediments has changed, varying spatially and temporally. When the ocean level was high shallow marine deposits occurred; when they were low fluvial and deltaic deposits form the majority of mass. [26] From the Triassic until the early Jurassic, faulting localized as extension faulting and wrench faulting.
The Red River is about 885 kilometres (550 mi) long, [2] of which about 635 kilometres (395 mi) are in the United States and about 255 kilometres (158 mi) are in Canada. [3] The river falls 70 metres (230 ft) on its trip to Lake Winnipeg, where it spreads into the vast deltaic wetland known as Netley Marsh.
Dunvegan Sandstone. The Dunvegan Formation is composed of marine, and deltaic sandstone with thin shale interbeds in the Peace River Country. East of Dunvegan, Alberta it is of marine origin, and in its western reaches in British Columbia it was deposited in a continental facies, where the sandstone becomes more conglomeratic.
A tidal freshwater delta [33] is a sedimentary deposit formed at the boundary between an upland stream and an estuary, in the region known as the "subestuary". [34] Drowned coastal river valleys that were inundated by rising sea levels during the late Pleistocene and subsequent Holocene tend to have dendritic estuaries with many feeder tributaries.
The sandstone is well-cemented [17] and contains no glacial deposits and no fossils. [19] The grains of Jacobsville Sandstone range from .25 to .5 mm (0.0098 to 0.0197 in) in size. [ 14 ] Based on an average from samples taken in Marquette and Alger counties, Jacobsville Sandstone is composed of: 27.4% nonundulatory quartz, 27.0% undulatory ...