Early recovery of sponge framework reefs after Cambrian archaeocyath extinction: Zhangxia Formation (early Cambrian Series 3), Shandong, North China

Jeong Hyun Lee, Jongsun Hong, Suk-Joo Choh, Dong Jin Lee, Jusun Woo, Robert Riding

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Reefs dominated by the anthaspidellid sponge Rankenella zhangxianensis, the calcimicrobe Epiphyton and the stem-group cnidarian Cambroctoconus orientalis, together with encrusting microstromatolites occur early in the middle Cambrian (Series 3, late Stage 5) of Shandong, eastern China. In the Zhangxia Formation, these in situ components created a tight framework, with centimeter-scale growth cavities mainly filled by fine-grained matrix. Among them, R. zhangxianensis and C. orientalis mutually attached and locally formed metazoan-dominated frameworks. These metazoan-microbial reefs form thin lenses  505 Ma, these Rankenella reefs indicate recovery of framework-building metazoans within ˜ 5 million years of the archaeocyath reef decline. In structure, they resemble archaeocyath reefs as well as Early Ordovician lithistid sponge-microbial reefs, having conjoined conical macroskeletons thickly veneered by calcimicrobes and microbial carbonate with largely matrix-filled intervening cavities. In combination with other sponge-microbial reefs reported from Australia, Iran, Korea and the USA, they demonstrate that an anthaspidellid sponge-microbial reef consortium was widespread throughout the mid-late Cambrian.

Original languageEnglish
Pages (from-to)269-276
Number of pages8
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume457
DOIs
Publication statusPublished - 2016 Sep 1

Keywords

  • Cambrian
  • Metazoan-microbial reef
  • Rankenella
  • Reef framework
  • Sponge

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Palaeontology
  • Earth-Surface Processes
  • Oceanography

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