نتایج جستجو برای: palynomorph
تعداد نتایج: 104 فیلتر نتایج به سال:
This paper presents the diatom and palynomorph data from a sediment trap deployed in northern part of East Barents Sea for an annual cycle August 2017 to 2018. The average monthly fluxes diatoms dinoflagellate cysts photic layer northeastern varies 10.4 × 103 640.8 valves m−2 day−1 0.3 90.0 day−1, respectively. Their are related low irradiance during sea-ice cover period, dominance southward cu...
The excellent preservation of the acritarchs, their great abundance, diversity and good stratigraphic control permit establishment of a detailed Middle and Late Cambrian acritarch biozonation. A total of 56 palynomorph species form the basis of 10 local acritarch assemblage zones. Assemblage zones I-II occur in the lower and middle parts of the Member C of the Mila Formation and suggest Early-m...
Floral diversity is a measure of number of type flora in an area, and reflects how vegetation develops in response to the environmental condition during a certain time interval. The present study aims to examine changes in the diversity of vegetation (pollen, spores and algae), evenness, and similarity in the Bandung Basin through a core of 240 cm depth using a ground drill, as well as the ...
Variations in sea surface conditions and level through the Holocene Kandalaksha Bay, White Sea, were reconstructed based on study of core sediments from outer using modern analog technique applied to dinocysts addition diatoms, TOC, δ13Corg, CaCO3, grain size data. The chronostratigraphy was defined accelerator mass spectrometry 14C dates mollusk shells. results indicated an increase water dept...
The surface of the lowland deltaic plain around Taihu (Lake Tai), south Yangtze river mouth in eastern China, lies near sea level and until recent drainage development by human societies was mostly covered wetlands various types. It created regular overbank flooding, mainly from Yangtze, deposition mineral sediments over several millennia since regained its current altitude early mid-Holocene p...
Abstract Historically, phytodebris (often considered a type of non-pollen palynomorph – NPP) has played prominent role in research into the fossil record early land plants. This consists cuticles and cuticle-like sheets, various tubular structures (including tracheids tracheid-like tubes) sundry other enigmatic fragments. Initial focused on elucidating their morphology, attempts to identify the...
New data and a biostratigraphic review on Silurian graptolites of the La Chilca Formation are presented. retiolitids monoserial described for first time in lower layers Salto Macho Member at Poblete Norte section, exposed Central Precordillera, San Juan Province, western Argentina. This member (late Hirnantian-early Wenlock) begins with pebble paraconglomerate covered by sedimentary succession ...
Integrated sedimentological, palynological, and palynofacies analyses of the Arrifes section in central Algarve Basin (southern Portugal) provided new information on age environments this Lower Cretaceous sequence. The sedimentary succession at consists fossiliferous interbedded limestones, marly marls, dated as latest Hauterivian to late Barremian (Lower Cretaceous) based key dinoflagellate ta...
Seventeen samples from the Cadeby Formation (Lopingian, Permian, EZ1) of Quarry near Doncaster, South Yorkshire, UK, yielded organic residues including phytoclasts, cuticle, unstructured tissue and generally well-preserved palynomorphs. The palynomorph assemblages are dominated by taeniate non-taeniate bisaccate pollen Klausipollenites schaubergeri, Limitisporites rectus, Lueckisporites virkkia...
The Middle to Late Holocene spread of agropastoralism throughout Eurasia not only subjected domesticated taxa stressors associated with novel environments but also induced changes in these following the introduction social-ecological systems. mountainous region Inner Asia comprises various steppe, meadow, and forest landscapes where zooarchaeological evidence suggests occupation by herding popu...
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