Attached vermiform gastropods in Carboniferous marginal marine stromatolites and biostromes
作者:
TREVOR P. BURCHETTE,
ROBERT RIDING,
期刊:
Lethaia
(WILEY Available online 1977)
卷期:
Volume 10,
issue 1
页码: 17-28
ISSN:0024-1164
年代: 1977
DOI:10.1111/j.1502-3931.1977.tb00586.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
Tubiform fossils conventionally referred toSerpulacf.advenaSalter and species ofSpirorbisLamarck from the British Lower Limestone Shales and Border Group (Lower Carboniferous) are re‐examined. They occur in peritidal carbonate environments of schizohaline aspect. These fossils superficially resemble calcareous polychaete tubes but have skeletal characters, including molluscan wall structure, numerous internal septa, and protoconch, which indicate that they represent a new group of substrate‐attached, disjunctly coiled gastropods. They resemble archaeogastropods in internal morphology of the skeleton but show parallels in external form and occurrence with the extant Vermetidae. There are two principal modes of occurrence: (1) erect tubes forming intertidal biostromes associated with non‐skeletal algal laminites, and (2) prostrate discoidal tubes encrusting subtidal skeletal stromatolites or occasionally forming larger irregular bioherms. These biostromes and bioherms are comparable in structure to Recent vermetid reef develop
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