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Variability of conch morphology in a cephalopod species from the Cambrian to Ordovician transition strata of Siberia

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dc.abstract.enA block of stromatolitic limestone found on the Angara River shore near Kodinsk, Siberia, derived from the exposed nearby Ust-kut Formation, has yielded a sample of 146 ellesmeroceratid nautiloid specimens. A minor contribution to the fossil assemblage from bellerophontid and hypseloconid molluscs suggests a restricted abnormal salinity environment. The associated shallow-water low diversity assemblage of the conodonts Laurentoscandodus triangularis and Utahconus(?)eurypterus indicates an age close to the Furongian–Tremadocian boundary. Echinoderm sclerites, trilobite carapaces, and hexactinellid sponge spicules were found in another block from the transitional strata between the Ust-kut and overlying ter-rigenous Iya Formation; these fossils indicate normal marine salinity. The conodont L. triangularis is there associated with Semiacontiodus iowensis and Cordylodus angulatus. This means that the stromatolitic strata with cephalopods are older than the early Tremadocian C. angulatus Zone but not older than the Furongian C. proavus Zone. The sample of nautiloid specimens extracted from the block shows an unimodal variability in respect to all recognizable aspects of their morphol-ogy. The material is probably conspecific with the poorly known Ruthenoceras elongatum from the same strata and region
dc.affiliationUniwersytet Warszawski
dc.contributor.authorDzik, Jerzy
dc.date.accessioned2024-01-26T11:45:31Z
dc.date.available2024-01-26T11:45:31Z
dc.date.issued2020
dc.description.financePublikacja bezkosztowa
dc.description.number1
dc.description.volume65
dc.identifier.doi10.4202/APP.00674.2019
dc.identifier.issn0567-7920
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/124538
dc.identifier.weblinkhttp://www.app.pan.pl/archive/published/app65/app006742019.pdf
dc.languageeng
dc.pbn.affiliationbiological sciences
dc.relation.ispartofActa Palaeontologica Polonica
dc.relation.pages149–165
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleVariability of conch morphology in a cephalopod species from the Cambrian to Ordovician transition strata of Siberia
dc.typeJournalArticle
dspace.entity.typePublication