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Volume 26 Issue 2
Apr 2015
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Abdelbaset S. El-Sorogy. Bryozoan Nodules as a Frame-Builder of BryozoanMicroreef, Middle Miocene Sediments, Egypt. Journal of Earth Science, 2015, 26(2): 251-258. doi: 10.1007/s12583-015-0528-9
Citation: Abdelbaset S. El-Sorogy. Bryozoan Nodules as a Frame-Builder of BryozoanMicroreef, Middle Miocene Sediments, Egypt. Journal of Earth Science, 2015, 26(2): 251-258. doi: 10.1007/s12583-015-0528-9

Bryozoan Nodules as a Frame-Builder of BryozoanMicroreef, Middle Miocene Sediments, Egypt

doi: 10.1007/s12583-015-0528-9
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  • Corresponding author: Abdelbaset S. El-Sorogy,
  • Received Date: 18 Jun 2014
  • Accepted Date: 15 Jan 2015
  • Publish Date: 01 Apr 2015
  • Bryozoan nodules,coralline algae,scleractinian corals and oysters form an important organic buildup,1.2–4.5 m thick in the Langhian-Serravaliann sediments of Egypt. Based on type,shape and size of the substrate,bryozoan nodules take tree-like and globular morphologies. Tree-like specimens reach 10 cm in maximum height and 3 cm in diameter,while Globular ones attain 9 cm in maximum diameter. Most tree-like nodules are perforated with wide or narrow pores,few are non-perforated. Globulars and few tree-like forms are with mamelon-like structures. Perforations on the outer surfaces may indicate a symbiotic relationship between bryozoans and a live plant substrate. Nodules from Homiera and Gharra areas of the Cairo-Suez District with wider perforations may indicate growth in slightly lighter or turbid areas of the continental shelf than those of North Western Desert of narrower perforations. Non-perforated nodules may assume an incrustation on ephemeral substrate.


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