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Article: Xianella: a new mat‐forming calcified cyanobacterium from the Middle–Late Ordovician of North China

Papers in Palaeontology - Volume 2 Part 3 - Cover Image
Publication: Palaeontology
Volume: 2
Part: 3
Publication Date: August 2016
Page(s): 439 449
Author(s): Jeong‐Hyun Lee, and Robert Riding
DOI: 10.1002/spp2.1049
Addition Information

How to Cite

LEE, J., RIDING, R. 2016. Xianella: a new mat‐forming calcified cyanobacterium from the Middle–Late Ordovician of North China. Papers in Palaeontology, 2, 3, 439-449. DOI: 10.1002/spp2.1049

Author Information

  • Jeong‐Hyun Lee - Department of Geology and Earth Environmental Sciences Chungnam National University Daejeon Korea (Email: jeonghyunlee@cnu.ac.kr)
  • Robert Riding - Department of Earth and Planetary Sciences University of Tennessee Knoxville TN USA (Email: rriding@utk.edu)

Publication History

  • Manuscript Accepted: 25 May 2016
  • Manuscript Received: 28 March 2016

Funded By

Basic Science Research Program of the National Research Foundation of Korea. Grant Number: 2015R1A6A3A03019727

Online Version Hosted By

Wiley Online Library
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Abstract

Xianella hongii gen. et sp. nov. is described from the Middle–Late Ordovician of Shaanxi, China and interpreted as a calcified cyanobacterial sheath. Xianella filaments formed cable‐like strands that constructed thick fenestral layers. The specimens occur in metre‐sized limestone blocks, possibly derived from local collapse of a reefal platform margin. In combination with micrite, some of which is intraclastic and peloidal, Xianella created thick and extensive stacks of layered calcified fenestral fabric that appear to be synsedimentarily calcified open‐frame mat deposits. The fenestrae range from small, laminose and very irregular, to large equidimensional areas ~2 cm across. Fenestrae with rounded outlines resemble primary gas bubbles observed in present‐day microbial mats. These delicate fabrics are comparable in structure and quality of preservation with those of some Proterozoic silicified stromatolitic mats.

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