New discoveries of the oldest trilobites Profallotaspis and Nevadella in the northeastern Siberian Platform, Russia


Authors: Bushuev E, Goryaeva I, Pereladov V

Published in: Bulletin of Geosciences, volume 89, issue 2; pages: 347 - 364; Received 25 January 2013; Accepted in revised form 3 March 2014; Online 24 March 2014

Keywords: Fallotaspididae, Profallotaspis, Nevadella, Paranevadella, trilobites, Cambrian Stage 3, Siberian Platform,

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Possibly the most ancient trilobites on the Siberian platform, belonging to the the Superfamily Fallotaspidoidea, were collected 36 m above the base of the middle Tyusser Formation, traditional lower Cambrian (Global Stage 3), in the Ulakhan-Aldyarkhai Creek section on the northern edge of the Cambrian Yudoma-Olenek sedimentary basin. These trilobite remains are probably slightly older that the first occurence of Profallotaspis jakutensis Repina, 1965 at other localities. Profallotaspis tyusserica sp. nov., although an olenellid, is characterised, among other features, by the “facial lines” that are possible incipient facial sutures, present anteriorly of ocular lobes and crossing the anterior margin of the cephalon. The occurrence of Profallotaspis tyusserica sp. nov. in the section is referred to the Profallotaspis Zone. The trilobites from the Pagetiellus anabarus-Nevadella Zone of the Cambrian Stage 3 were found 14.2 m above the FAD of Profallotaspis


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