Dinocerata, a Monograph of an Extinct Order of Gigantic Mammals
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Red beds
This study focuses on the lithostratigraphy and paleoenvironment reconstruction of the Upper Cretaceous in the Junggar Basin, which is characterized by a succession of red beds. The Upper Cretaceous in the Junggar Basin is regionally variable in thickness and poor in fossils. However, ostracod fossils from these rocks are characteristic of Late Cretaceous. Three ostracod assemblage zones have been recognized. These assemblage zones offer a biostratigraphic tool to correlation of Upper Cretaceous successions in the Junggar Basin.
Ostracod
Lithostratigraphy
Red beds
Assemblage (archaeology)
Stratigraphic unit
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The sedimentary history of the Norwegian-Greenland Sea is typical of rifted-margin ocean basins; it is marked by stratigraphic sequences that (1) were deposited in deeper water through time, as oceanic crust subsided away from the active spreading ridge, and (2) become finer grained and more biogenic through time, as the continental source areas moved farther away from the active spreading ridge during widening of the ocean basin.Nonmarine redbeds above subaerially weathered basalt form the base of the oldest sequences, formed when rifting of the single continent began.Turbidites were subsequently deposited as the rift widened, deepened, and became oceanic.Hemipelagic mudstones were deposited with further widening, and then biogenic calcareous and siliceous oozes were deposited as the influence of the distant continental margins on sedimentation diminished.Finally, ice-rafted glacial deposits blanketed the entire sea floor and all older deposits; the glacial deposits directly overlie newly created Plio-Pleistocene ocean floor near the active spreading ridge.A great variety of sedimentary structures, trace fossils, and related features are found within these stratigraphic sequences, which are complicated by the irregular tectonic history of the Norwegian-Greenland Sea.
Red beds
Contourite
Continental Margin
Seafloor Spreading
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