Exotic trilobites from the uppermost Cambrian Series 3 and lower Furongian of Sweden
作者： Anna Żylińska , Thomas Weidner , John Ahlgren , Per Ahlberg
关键词: Ptychoparia 、 Ecological succession 、 Facies 、 Gondwana 、 Geology 、 Paleontology 、 Laurentia 、 Cambrian Series 3 、 Glacial period 、 Baltica
摘要: Seventeen taxa of exotic trilobites representing eight families are described from the olenid- and agnostoid-dominated strata uppermost Cambrian Series 3 lower Furongian alum shale facies Sweden glacial erratic boulders Denmark. Only assigned to species level, i.e., Maladioidella abdita (Salter, 1866), Olentella rara (Westergard, 1922), Pedinocphalus peregrinus (Henningsmoen, 1957), Ptychoparia pusilla (Westergard. Westergaardella olenorum whereas others left under open nomenclature or remain unrecognized. Most for first time Scandinavia. Their affinities point a strong connection with East Gondwana, Laurentia, Kazakhstania Siberia. Exotic appear in succession directly after periods very low oxygen concentration Alum Shale Sea; their occurrences correspond ranges agnostoid arthropods seem be linked global transgressive events causing an influx cool mid depleted waters onto shelf Baltica palaeocontinent (Less)
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