Tagasi otsingusse
McIlroy et al., 2001

Palaeobiology and evolution of the earliest agglutinated Foraminifera: Platysolenites, Spirosolenites and related forms

McIlroy, D., Green, O. R., Brasier, M. D.
DOI
DOI10.1080/002411601300068170
Aasta2001
AjakiriLethaia
Köide34
Number1
Leheküljed13-29
Tüüpartikkel ajakirjas
Keelinglise
Id1555

Abstrakt

Tubular agglutinated fossils of Platysolenites antiquissimus Eichwald, 1860, P. cooperi n. sp. and Spirosolenites spiralis Glaessner, 1979 are examined from selected lower Cambrian successions in Avalonia (England; Wales; Newfoundland) and Baltica (Russia and Estonia). Platysolenites cooperi n.sp. is shown to extend below the first appearance of P. antiquissimus in the Neoproterozoic-Cambrian boundary stratotype region, SE Newfoundland, and to occur at higher stratigraphic levels in Wales and Finnmark. Taphonomic, teleological and ultrastructural studies on well-preserved material are consistent with a similar grade of organization and mode of life for P. antiquissimus and the living astrorhizacean foraminiferid Bathysiphon. However, agglutinated proloculi are here described from both rectilinear P. antiquissimus and coiled S. spiralis, which suggests that neither were typical astrorhizaceans.

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