نتایج جستجو برای: magnetostratigraphy

تعداد نتایج: 280  

Journal: :Geosciences 2022

Planktic foraminifera are commonly used for first-order age control in deep-sea sediments from low-latitude regions based on a robust tropical–subtropical zonation scheme. Although multiple Neogene planktic foraminiferal biostratigraphic zonations mid-latitude exist, quantification of diachroneity the species as datums to test paleobiogeographic patterns origination and dispersal is lacking. He...

Journal: :Quaternary Geochronology 2022

Fluvial sediments of the middle Atbara River Valley, eastern Sudan, contain abundant vertebrate fossils and stone tools. Previous work described two sedimentary units, Butana Bridge Synthem (BBS) Khashm El Girba (KGS), with three divisions each (BBS1-3 KGS1-3, from bottom to top, respectively). 230Th/U dating on bivalve shells suggested an age ∼126 ∼92 ka for basal KGS2 KGS3, respectively, mamm...

Journal: :Geologica Acta 2021

An extense systematic description of the Eocene larger foraminiferal faunas recorded in South Pyrenean Basin (Sierras Exteriores) is presented herein. The large dataset provided this work includes both Nummulites and Alveolina species, along with a variety other porcellaneous hyaline taxa lesser biostratigraphic relevance, are represented. foraminifera described correspond mainly to Lutetian (S...

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