نتایج جستجو برای: unconformity
تعداد نتایج: 431 فیلتر نتایج به سال:
The Cretaceous deposits in Morakan, located in the northeast of Khoy, a town in western Azerbaijan province, Iran, are primarily made up of carbonate rocks. These deposits, which are of 717 meters thick, lie on the clastic facies of Jurassic and are covered with beneath the pelagic beds of the Upper Cretaceous. To investigate the facies, sedimentary environment and sequential stratigraphy of th...
The case for a glacial origin for the upper Proterozoic Kingston Peak Formation is weak. Stratigraphic correlations and rock descriptions suggest a marine depositional environment for the entire formation. The Lower Sandstone Unit of the Kingston Peak Formation is best interpreted as an Antediluvian inner shelf deposit. It is underlain by other widespread shelf deposits, the Beck Spring Dolomit...
Abstract The Great Unconformity is an iconic geologic feature that coincides with enigmatic period of Earth's history spans the assembly and breakup supercontinent Rodinia Snowball Earth glaciations. We use zircon (U-Th)/He thermochronology (ZHe) to explore erosion below at its classic Grand Canyon locality in Arizona, United States. ZHe dates are as old 809 ± 25 Ma data patterns differ across ...
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