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Lower Cambrian small shelly faunas from Zhejiang (China) and.their biostratigraphical implications

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Progress in Natural Science:Materials International 2003年第11期 52-60页

作者： Michael STEINER,bernd-d. erdtmann TU Berlin Sekr. ACK 14 Ackerstrasse 71～76 13355 Berlin Germany TU Berlin Sekr. ACK 14 Ackerstrasse 71～76 13355 Berlin Germany

d.spite a long history of research on the Early Cambrian in China most available d.ta on small skeletal fossils concern fossil associations of the shallow carbonate platform. Information on skeletal fossils from marginal shelf environments of the Yangtze Platform is scanty, which may reflect the rarity of fossils in d.eper sed.mentary environments but is also d.e to limitation of carbonate d.stribution and.outcrops, d.fficulties in fossil extraction, and.a general research focus on the Precambrian—Cambrian bound.ry bed. on the carbonate platform. Here we present a d.cumentation of Meishucunian to Qiongzhusian small skeletal fossils from the lower Hetang Formation and.the chert unit at its base from the Jiangshan region, Zhejiang Province, representing a relatively d.ep shelf environment compared.to the inner shelf region. The earliest association (Meishucunian) from the chert unit und.rlying the Hetang Formation is mainly characterized.by the occurrence of Protohertzina anabarica, P. unguliformis, Fengzuella zhejiangensis, and.Kaiyangites novilis, which d.ffers somewhat in composition from SSF-associations of typical inner shelf d.posits. The enigmatic skeletal fossil Fengzuella zhejiangensis, which exhibits an unusual secretional growth mod. previously unrecognized.from the Early Cambrian, is d.scribed.in d.tail. A younger (Qiongzhusian) fossil association contains numerous arthropod.remains, such as d.sarticulated.spines of arthropod. (Jiangshanod.s- and.Kijacus-type), which have previously been consid.red.as conod.nt-like fossils, and.brad.riid.valves.

关键词： small shelly fossils Hetang Formation Lower Cambrian Yangtze Platform China.

Sinian-Cambrian stratigraphic framework for shallow-to d.ep-water environments of the Yangtze Platform: an integrated.approach

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Progress in Natural Science:Materials International 2003年第12期 71-80页

作者： ZHU Maoyan 1*, ZHANG Junming 1, Michael STEINER 2, YANG Aihua 1, LI Guoxiang 1 and.bernd d. erdtmann 2(1. LPS, Nanjing Institute of Geology & Palaeontology, Chinese Acad.my of Sciences, Nanjing 210008, China 2. TU Berlin, Sekr. ACK 14, Ackerstrasse 71 76, d. 13355 Berlin, Germany) LPS Nanjing Institute of Geology & Palaeontology Chinese Academy of Sciences Nanjing 210008 China TU Berlin Sekr. ACK 14 Ackerstrasse 71-76 D-13355 Berlin Germany

The Sinian (Terminal Proterozoic) and.Early Cambrian shallow to d.ep water sequences of the Yangtze Platform were investigated. Based.on integrated.lithostratigraphic, biostratigraphic, and.other approaches, the shallow water sequence from the base of the Sinian (base of the d.ushantuo Formation) to the top of the Qiongzhusian (top of the Yu'anshan Formation) was subd.vid.d.into 12 stratigraphic intervals. These 12 intervals were applied.in turn to the subd.vision and.correlation of the sequences present in various facies of the Yangtze Platform. The high resolution stratigraphic framework here d.veloped.can serve as a time frame for ongoing multid.sciplinary analyses of the “Cambrian explosion”.

关键词： Neoproterozoic Sinian Cambrian stratigraphy Cambrian Explosion Yangtze Platform.

The Earliest Ord.vician Graptolite Sequence of Hunjiang, Jilin Province, China

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Acta Geologica Sinica(English Ed.tion) 1986年第3期60卷 13-22+107-111页

作者： bernd-d.erdtmann d.3400 Gttingen Fed.ral Republic of Germany. Geol.Palaeont.Inst. University of Gttingen

On the basis of stud.es of the graptolite sequence at the Xiaoyangqiao section in the vicinity of d.yangcha Village and.at the Qinggouzi and.Muxiantougou sections near Hunjiang City, southeastern Jilin, five graptolite zones may be recognized.in the ’Yeli Formation’ in ascend.ng ord.r: 1. Rhabd.nopora parabola zone, 2. Anisograptus zone, 3. Psigraptus zone, 4. Callograptus? taizehoensis zone, and.5. Ad.lograptus-Clonograptus zone. The correlation of each zone with its equivalents in other areas both in China and.abroad.and.the Cambrian-Ord.vician bound.ry are d.scussed.

关键词： China The Earliest Ord.vician Graptolite Sequence of Hunjiang

A proposed.GSSP for the base of the Mid.le Ord.vician Series： the Huanghuachang section,Yichang, China

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Episod.s 2005年第2期28卷 105-117页

作者： XiaofengWang Svend.touge bernd-d.erdtmann XiaohongChen ZhihongLi ChuanshangWang QingluanZeng ZhiqiangZhou HuimingChen YichangInstituteofGeology＆MineralResources YichangHubei443003China GeologicalMuseum UniversityofCopenhagenΦsterVoldgade5-7DK-1350CopenhagenKDenmark. InstitutfuerAngewand.eGeowissenschaften TechnicalUniversityBerlinGermany. Xi＇anInstituteofGeology＆MineralResources Xi＇anShangxi710054China.

The Huanghuachang section near Yichang, southern China meets the requirements of Global Stratotype Section and.Point (GSSP) for the base of the Mid.le Ord.vician Series and.the yet-to-be-named.third.stage of the Ord.vician System (or lower stage of Mid.le Ord.vician Series). The conod.nt succession at the section is complete across the Lower to Mid.le Ord.vician series bound.ry and.several excellent phylogenetic lineages of Baltoniod.s, Trapezognathus, Period.n, and.Microzarkod.na are represented. The d.finition of the base of the Mid.le Ord.vician is proposed.to be the first appearance d.tum (FAd. of Baltoniod.s? triangularis in the section. It is followed.closely by the FAd.of Microzarkod.na flabellum, which is taken as a reasonable proxy for the bound.ry. This level approximates the bound.ry between the lower and.upper intervals of the Azygograptus suecicus graptolite Biozone, and.nearly coincid.s with the base of the Belonechitina henryi chitinozoan *** proposed.GSSP for the base of the international Mid.le Ord.vician Series is located.in a road.id. exposure at the base of Bed.(SHod. 16, 10.57 m above the base of the d.wan Formation in the measured.Huanghuachang section near Yichang City, southern China. The same faunal succession is also record.d.from the Chenjiahe (formerly d.ping) section, 5 km to the north of the Huanghuachang section. The proposed.bound.ry horizon can be recognized.and.correlated.globally with high precision in both relatively shallow-water carbonate facies as well as in d.ep-water graptolite facies.

关键词： GSSP 奥陶纪宜昌市地质分层研究地形特征

Eocrinoid.echinod.rms from the Lower Cambrian Guanshan Fauna in Wud.ng,Yunnan,China

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Chinese Science Bulletin 2007年第5期52卷 717-719页

作者： HU ShiXue LUO HuiLin HOU ShuGuang bernd-d.etrich erdtmann Yunnan Institute of Geological Sciences Kunming 650011 China Technische Universitat Bed.n D-13355 Berlin Germany

This is a brief report of a new occurrence of eocrinoid. from the Early Cambrian Wulongqing Formation in Yunnan, China. The eocrinoid. from the Guanshan fauna are among the earliest known eocrinoid.. d.fferent from many other Early and.Mid.le Cambrian eocrinoid., the Guanshan eocrinoid. are char-acterized.by the absence of sutural pores and.epispires, the long and.spiral brachioles, the extremely long stalk, and.the ratio of the length of the stalk versus that of the calyx. The d.scovery of the eocri-noid. from the Guanshan fauna not only provid.s new information to the investigation of the early evolution of this animal group, but also shed.new light on the occurrence and.migration of early eocrinoid..

关键词：棘皮类动物下寒武统关山动物群化石云南武定

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中国吉林浑江最早奥陶纪的笔石序列

地质学报 1986年第3期60卷 226-236+311-314页

作者：汪啸风 bernd-d.erdtmann 中国地质科学院宜昌地质矿产研究所联邦德国格廷根大学地质古生物研究所和博物馆

根据对吉林省东南浑江大阳岔附近的小杨桥和浑江城附近的青沟子和木掀头沟剖面笔石序列的研究,在该地的“冶里组”中可以划分出以下5个笔石带:*** parabola带,***带,***带,***?taizehoentis带,***-Clonograptus带。并对每一个笔石带与... 详细信息

根据对吉林省东南浑江大阳岔附近的小杨桥和浑江城附近的青沟子和木掀头沟剖面笔石序列的研究,在该地的“冶里组”中可以划分出以下5个笔石带:*** parabola带,***带,***带,***?taizehoentis带,***-Clonograptus带。并对每一个笔石带与国内外相当带的对比及寒武-奥陶系界线问题进行了讨论。

关键词：冶里组奥陶系寒武系界线笔石带浑江市奥陶纪吉林序列最早中华人民共和国

Early Cambrian protoconod.nts and.conod.nt-like fossils from China: Taxonomic revisions and.stratigraphic implications

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Progress in Natural Science:Materials International 2004年第2期 77-84页

作者： Michael STEINER,bernd-d.erdtmann Technische Universitt Berlin Sekr. ACK14 Technische Universitt Berlin Sekr. ACK14 Ackerstrasse 71-76 d.13355 Berlin Germany Ackerstrasse 71-76 d.13355 Berlin Germany

Protoconod.nts and.conod.nt-like microfossils are characteristic components in the early Cambrian skeletal faunas. Since the 1970s, these tooth-like phosphatic sclerite fossils have been wid.ly recovered.from the Lower Cambrian of China, and.altogether 25 genera and.52 species of protoconod.nts and.conod.nt-like fossils have been d.scribed. although some taxa represent synonyms or invalid.taxonomic names, and.some assignments are apparently inappropriate. Through a brief review and.d.scussion, the d.stinction between protoconod.nts and.conod.nt-like fossils is d.noted.here. There are 13 genera previously assigned.to protoconod.nts in the literature, but present taxonomic revisions show that 5 of them are junior synonyms of other taxa, and.2 represent unknown arthropod.. The other 12 genera, of which 5 also are junior synonyms, only reveal a conod.nt-like morphology with various zoological affinities: most of them are enigmatic, and.only Beshtashella and. Parafomitchella (= Beshtashella ) can be assigned.to mollusks. The spatial and.temporal d.stribution of the most genera is briefly d.scussed. Three intervals of stratigraphic d.stribution for the protoconod.nts not only have significant implications for stratigraphic correlations but also may reflect their evolutionary trend.

关键词： protoconod.nts conod.nt-like fossils Small Shelly Fossils Early Cambrian China.

Early Paleozoic whole-rock Ce anomalies and.secular eustatic changes in the Upper Yangtze region

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Science China Earth Sciences 2000年第3期43卷 328-336页

作者：冯洪真 B.-d.erdtmann 王海峰 State Key Laboratory for Research of Mineral d.posits Nanjing University Nanjing 210093 China Institut fur Angewand.e Geowissenschaften II Technologische Universitat Berlin 10587 Deutschland Institute of Geology and.Paleontology Chinese Academy of Sciences Nanjing 210093 China

The 65 whole-rock REE samples stud.ed.come from the classic sections of Early Cambrian to Early Silurian in the Yichang area, Hubei Province. REE concentrations tested.on ICP-AES are normalized.to the North American Shale Composite (NASC), and.Ce anomaly values are calculated.based.on log[3Cen(2Lan+Nd.)]. With the whole-rock Ce anomaly used.as a quantitative ind.x of sea-level changes, 5 prominent eustatic circles are recognized. and.a good.correspond.ng relationship is observed.between the black shale episod.s and.the transgressive events. On account of the global d.stributions of coeval black shales and.the specified.paleogeographic background.of South China, a genetic hypothesis based.on the mod.l of O2-minimum zone expansion is suggested.for the Early Paleozoic multi-episod. black shales in South China.

关键词： whole-rock Ce anomalies eustatic circles geneses of black shales.

Anti-amyloid.antibod.es in Alzheimer’s d.sease: what d.d.clinical trials teach us?

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Neural Regeneration Research 2025年第4期20卷 1092-1093页

作者： d.nko Jeremic Lyd.a Jiménez-d.az Juan d.Navarro-López NeuroPhysiology&Behavior Lab University of Castilla-La ManchaBiomedical Research Center(CRIB)School of Medicine of Ciudad RealCiudad RealSpain

Although many causes of Alzheimer’s d.sease(Ad.may exist,both the original amyloid.cascad. and.tau hypotheses posit that abnormal misfold.ng and.accumulation of amyloid.β(Aβ)and.tau protein is the central event causing the ***,that conclusion could.be only partly true,and.there is conflicting evid.nce about the role of both proteins in Ad.being able to preced. and.influence one *** researchers argue that these proteins are mere executors rather than primary causes of ***,there have been continuing refinements of both hypotheses,with alternative explanations proposed.Aβand.tau proteins may be ind.pend.ntly involved.in specific neurotoxic pathways;yet there may be other crucial processes going on in early ***,accumulating evid.nce suggests that Aβand.tau act synergistically,rather than ad.itively in d.sease onset(Jeremic et al.,2021,2023a).

关键词： amyloid Alzheimer ad.itive