Evidence of Holocene compression at Tuluá, along the western foothills of the Central Cordillera of Colombia
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Abstract:
Morphotectonic and paleoseismic studies carried out in the surrounds of Tuluá (4°N, 76°W) provide strong supporting evidence for ongoing E-W compression in the Cauca Valley, Colombia, during the late Pleistocene and Holocene. This local tectonic regime is kinematically and mechanically connected with the ENE-striking, right-lateral, strike-slip Ibagué fault system, which crosscuts and offsets the Central Cordillera of Colombia.Keywords:
Foothills
Central Asia
Neotectonics
Three new species of cytheracean ostracodes-Cytherura? mainensis (Holocene and Pleistocene), Munseyella atlantica (Holocene), and M. mananensis (Holocene and Pleistocene)-and their distributions are described. Munseyella is reported from the Holocene off northeastern North America for the first time, and its soft parts are described and illustrated, also for the first time.
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Based on the analyses of grain size,magnetic susceptibility,sporopollen,foraminifera,lithology and AMS14C from SC1 core in Chenghu Lake,this paper discusses the evolutions of climate and paleoenvironment since Late Pleistocene.The records of sporopollen show that climate is accord with the world's: warm-wet during the Late Pleistocene,a cool and dry climate during the last glaciation,warm-wet in the Early Holocene,a hot-wet climate in the Middle Holocene,cool-dry to warm-moist during the Late Holocene;Two marine invasion events are discovered,one is Gehu during Late Pleistocene and the other is Zhenjiang in the Middle Holocene.This district has undergone great palaeogeographic changes since Late Pleistocene: rivers in the Late Pleistocene,rivers and marshlands during the last glaciation,flood plain-estuary during the Early Holocene,estuary-shallow marine in the Middle Holocene,lakes and marshlands during the Late Holocene.
Holocene climatic optimum
Lithology
Marine transgression
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Based on the analyses of grain size,sporopollen,foraminifera,AMS14 C and OSL dating from LH01Core in the Northern Liaodong Bay,the evolutions of climate and paleoenvironment since Late Pleistocene are discusses in this paper.LH01Core has undergone great palaeogeographic changes since Late Pleistocene:rivers and lakes in the Late Pleistocene,marine and lands during the Early Holocene,shallow marine in the Middle Holocene,estuary shallow marine during the Late Holocene.The records of sporopollen show that climate:cool-dry during the Late Pleistocene,cool-wet during the Late Pleistocene, cool-wet in the Early Holocene,hot-wet in the Middle Holocene,hot-dry in the Middle Holocene,warmdry during the LateHo locene.PanShan invasion event is discovered aboaut 7.5ka BP in LH01Core.
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Among the species of Mycena and related genera of the Himalayan foothills described in this paper, the following are proposed as new: Mycena abietina, M. bathyrrhiza, M. cinnabarina, M. coalita, M. gentilis, Hydropus eburneus, and Xeromphalina aspera.
Foothills
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