نتایج جستجو برای: biostratigraphic correlation
تعداد نتایج: 391148 فیلتر نتایج به سال:
The biostratigraphic distribution of orbitolinids for the Barremian SE France proposed hereafter is calibrated on ammonite biozonation. This work based study eleven sections with associated to macrofossils (ammonites and/or echinids) significant in terms biostratigraphy or overlain levels bearing above macrofossils.
Recent studies suggest a marked expansion of glacial ice across much of Gondwana beginning in the earliest Permian. Because expansion of glacial ice results in a lowering of sea level, the imprint of ice expansion should be evident worldwide as significant exposure event, hiatuses, or other evidence for sea level drop at or near the Pennsylvanian–Permian boundary. This literature review investi...
Rare calcareous nannofossils from the Cape Roberts Project drillhole CRP-2A indicate that this area was episodically invaded by marginal oceanic surface waters during the late and late early Oligocene. These depauperate assemblages lack most of the biostratigraphic index fossils for the Oligocene, but do provide two datums that aid in constraining the age of the section: the last appearance dat...
The degree to which emergent surfaces are correlated in late Asbian carbonate successions Britain and Ireland is assessed by the integration of detailed biostratigraphy diversity trends foraminifers. Data related Trowbarrow Quarry section northern England, provides a reference for upper because its rich assemblages high sampling density. Diversity shown be non-random, possess cyclic behaviour, ...
Abstract Acritarch biostratigraphic and δ 13 C chemostratigraphic data from the Krol A Formation in Solan area (Lesser Himalaya, northern India) are integrated to aid inter-basinal correlation of early–middle Ediacaran strata. We identified a prominent negative excursion (likely equivalent EN2 lower Doushantuo Yangtze Gorges South China), over dozen species acanthomorphs (including two new spec...
Abstract Well-preserved Carnian (Late Triassic) palynomorphs are rare in Switzerland, despite sediments include one of the important plant fossil localities, Neue Welt near Basel. Modern detailed palynological studies on Triassic general and especially scarce, most were carried out more than 50 years ago. Nevertheless (Late) still yield surprises for research. Here, we present results re-study ...
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