Middle Cambrian (Wuliuan Stage) Small Shelly Fossils from North Greenland (Laurentia)

 

Authors: Peel J

Published in: Bulletin of Geosciences, volume 100, issue 1; pages: 1 - 56; Received 20 August 2024; Accepted in revised form 4 December 2024; Online 9 March 2025

Keywords: Small Shelly Fossils, Cambrian, Miaolingian, Wuliuan, North Greenland, Laurentia,

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Abstract

Acid residues from the Henson Gletscher Formation of North Greenland have yielded the most diverse assemblage of Small Shelly Fossils (SSF) known from the middle Cambrian (Miaolingian Series) of Laurentia. The fossils derive from the Wuliuan Stage (Ptychagnostus gibbus Biozone; Topazan Regional Stage of North America) and compare with faunas from the Ordian-Templetonian regional stages of Australia and the Kuonamka Formation of Northern Siberia, making a valuable contribution to world-wide early Miaoliongian correlation. The assemblage is dominated by 21 species of helcionelloid molluscs, a third of which are referred to Dorispira Parkhaev, 2010. Mellopegma Runnegar & Jell, 1976 and Erugoconus Peel & Kouchinsky, 2022, are also conspicuous. Hyoliths include the operculate Protowenella Runnegar & Jell, 1976, Crestjahitus Sysoev, 1968 and Yuku? Kruse, 2002. Diverse form taxa of sponge spicules are also well represented in Siberia and Australia. The phosphatocopid Dabashanella Huo, Shu, & Fu, 1983, well known from China, is abundant. Diagenetic phosphatization of soft parts is common in bivalved arthropods, but rare cases include Dietericambria Peel, 2022a, the oldest known pentastomid, and a priapulid larva. Preservation as phosphatic internal moulds is otherwise characteristic. Multiaxial organisms include cnidarians and epiphytiform taxa of uncertain position. The stem group octocoral Cambroctoconus Park, Woo, Lee, Lee, Lee, Han, Chough & Choi, 2011, described from China and Kyrgyzstan, is common. Bromalites and casts of euendolith galleries are abundant and diverse in form. New taxa: Crestjahitus groenlandicus sp. nov., Dabashanella? lunaiformis sp. nov., Hensonidendra tavsenica gen. et sp. nov., Hensonidendra hensoniensis gen. et sp. nov., Laugephakos groenlandicus gen. et sp. nov., Liangshanella? qassutit sp. nov., Tavsenicoralla avannaa gen. et sp. nov.

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