First report on Guanshan Biota(Cambrian Stage 4) at the stratotype area of Wulongqing Formation in Malong County, Eastern Yunnan, China
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摘要
Exceptionally preserved fossils,such as those from Cambrian Burgess Shale-type fossil-Lagerstatten are critical because of their unique contributions to knowledge of the phylogenetic radiation and palaeoecological expansion of metazoans during the Cambrian explosion.Critically,these deposits provide information that is usually unobtainable from shelly and skeletonized fossils alone.The Guanshan Biota(Cambrian Series 2,Stage 4)in the Yunnan Province of South China,has produced abundant and diverse,exquisitely preserved fossils that often retain soft tissues and organs.To date,most fossils from the Guanshan Biota have been collected from localities such as Gaoloufang and Gangtoucun,which have become inaccessible due to new urban expansions and constructions of residential buildings.Here we present the first report of soft bodied fossils from a new section at Kanfuqing,close to the Wulongqing village in Malong County,approximately 3 km east of the Wulongqing Formation stratotype section.Fossils retain soft morphology,and include brachiopods with delicate marginal setae,priapulids with well-preserved sclerites and vetulicolians with entire sections of body.In addition,this fauna includes rare occurrences of trilobites preserved with soft tissues replicated as pyrite pseudomorphs after weathering.This discovery represents an important palaeogeographical extension of soft-bodied fossils of the Guanshan fauna to the east of the Xiaojiang Fault(related to Tsinning tectonic movements ca.700 Ma).The fauna from the new Kanfuqing section is similar to that reported from the Wulongqing Formation west of the Xiaojiang Fault,and thus has significant implications for early Cambrian palaeogeography,faunal successions and palaeoenvironments of eastern Yunnan.
Exceptionally preserved fossils,such as those from Cambrian Burgess Shale-type fossil-Lagerstatten are critical because of their unique contributions to knowledge of the phylogenetic radiation and palaeoecological expansion of metazoans during the Cambrian explosion.Critically,these deposits provide information that is usually unobtainable from shelly and skeletonized fossils alone.The Guanshan Biota(Cambrian Series 2,Stage 4)in the Yunnan Province of South China,has produced abundant and diverse,exquisitely preserved fossils that often retain soft tissues and organs.To date,most fossils from the Guanshan Biota have been collected from localities such as Gaoloufang and Gangtoucun,which have become inaccessible due to new urban expansions and constructions of residential buildings.Here we present the first report of soft bodied fossils from a new section at Kanfuqing,close to the Wulongqing village in Malong County,approximately 3 km east of the Wulongqing Formation stratotype section.Fossils retain soft morphology,and include brachiopods with delicate marginal setae,priapulids with well-preserved sclerites and vetulicolians with entire sections of body.In addition,this fauna includes rare occurrences of trilobites preserved with soft tissues replicated as pyrite pseudomorphs after weathering.This discovery represents an important palaeogeographical extension of soft-bodied fossils of the Guanshan fauna to the east of the Xiaojiang Fault(related to Tsinning tectonic movements ca.700 Ma).The fauna from the new Kanfuqing section is similar to that reported from the Wulongqing Formation west of the Xiaojiang Fault,and thus has significant implications for early Cambrian palaeogeography,faunal successions and palaeoenvironments of eastern Yunnan.
Exceptionally preserved fossils,such as those from Cambrian Burgess Shale-type fossil-Lagerstatten are critical because of their unique contributions to knowledge of the phylogenetic radiation and palaeoecological expansion of metazoans during the Cambrian explosion.Critically,these deposits provide information that is usually unobtainable from shelly and skeletonized fossils alone.The Guanshan Biota(Cambrian Series 2,Stage 4)in the Yunnan Province of South China,has produced abundant and diverse,exquisitely preserved fossils that often retain soft tissues and organs.To date,most fossils from the Guanshan Biota have been collected from localities such as Gaoloufang and Gangtoucun,which have become inaccessible due to new urban expansions and constructions of residential buildings.Here we present the first report of soft bodied fossils from a new section at Kanfuqing,close to the Wulongqing village in Malong County,approximately 3 km east of the Wulongqing Formation stratotype section.Fossils retain soft morphology,and include brachiopods with delicate marginal setae,priapulids with well-preserved sclerites and vetulicolians with entire sections of body.In addition,this fauna includes rare occurrences of trilobites preserved with soft tissues replicated as pyrite pseudomorphs after weathering.This discovery represents an important palaeogeographical extension of soft-bodied fossils of the Guanshan fauna to the east of the Xiaojiang Fault(related to Tsinning tectonic movements ca.700 Ma).The fauna from the new Kanfuqing section is similar to that reported from the Wulongqing Formation west of the Xiaojiang Fault,and thus has significant implications for early Cambrian palaeogeography,faunal successions and palaeoenvironments of eastern Yunnan.
引文
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Gedik,I.,1989.Hadimopanellid biostratigraphy in the Cambrian of the western Taurids:a new biostratigraphic tool in the subdivision of Cambrian system.Geological Bulletin of Turkey 32,65-78.
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Han,J.,Liu,J.,Zhang,Z.,Zhang,X.,Shu,D.,2007b.Trunk ornament on the palaeoscolecid worms cricocosmia and Tabelliscolex from the early Cambrian Chengjiang deposits of China.Acta Palacontologica Polonica 52(2),423-431.
Hu,S.X.,2005.Taphonomy and Palaeoecology of the Early Cambrian Chengjiang Biota from Eastern Yunnan,China,vol.7.Berlier Palaobiologische Abhandlungen,Berlin,pp.1-197.
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Hu,S.X.,Li,Y.,Luo,H.L,Fu,X.P.,You,T.,Pang,J.Y.,Liu,Q.,Steiner,M.,2008.New record of palaeoscolecids from the early Cambrian of Yunnan,China.Acta Geological Sinica 82(2).244-248.
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Hu,S.X.,Zhu,M.Y.,Steiner,M.,Luo,H.L.,Zhao,F.C.,Liu,Q.,2010b.Biodiversity and taphonomy of the early Cambrian Guanshan Biota,Eastern Yunnan.Science China Earth Sciences 53,1765-1773.
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Huang,D.Y.,2005.Early Cambrian Worms from SW China:Morphology,Systematics,Lifestyle and Evolutionary Significance,vol.1.University Lyon,Lyon,p.245.Ph.D thesis.
Hopkins,M.J.,Chen,F.Y.,Hu,S.X.,Zhang,Z.F.,2017.The oldest known digestive system consisting of both paired digestive glands and a crop from exceptionally pres erved trilobites of the Guanshan Biota(Early Cambrian,China).PloS One 12(9),e0184982.
Hou,J.B.,Hughes,N.C.,Yang,J.,Lan,T.,Zhang.X.,Ch rysalyn,D.,2016.Ontogeny of the articulated yiliangellinine trilobite Zhangshania typica from the lower Cambrian(Se ries 2,Stage 3)of southern China.Journal of Paleontology 91(1),86-99.
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