Middle Ordovician Tetradium microatolls and a possible bathymetric gradient in tetradiid morphology

Webb, Gregory E. (1997) Middle Ordovician Tetradium microatolls and a possible bathymetric gradient in tetradiid morphology. Real Sociedad Espanola de Historia Natural. Boletin. Seccion Geologica, 92 1-4: 177-186.

Author Webb, Gregory E.
Title Middle Ordovician Tetradium microatolls and a possible bathymetric gradient in tetradiid morphology
Formatted title
Middle Ordovician Tetradium microatolls and a possible bathymetric gradient in tetradiid morphology
Journal name Real Sociedad Espanola de Historia Natural. Boletin. Seccion Geologica
ISSN 0583-7510
Publication date 1997
Year available 1997
Sub-type Article (original research)
Open Access Status Not Open Access
Volume 92
Issue 1-4
Start page 177
End page 186
Total pages 10
Place of publication Madrid, Spain
Publisher Real Sociedad Espanola de Historia Natural
Language eng
Formatted abstract
Tetradiid corals are abundant in the uppermost Poolevile Member of the Middle Ordovician Bromide Formation in South-central Oklahoma (USA). The regressional Pooleville Member consists of a series of stacked peritidal cardonate cycles, culminating in a regional unconformity. The vertical succession of facies in each cycle suggest an on-shore to off-shore transition from intertidal/supratidal desiccated microbial laminites, through biotrubated, poorly fossiliferous marls and micrites , to deeper subtidal fossiliferous marls and grainstones. Tetradiids occurred in the subtidal portion of each cycle. in successive cycles, the subtidal portion was shallower, or closer to shore, than that of the immediately preceeding cycle. Th highest two cycles contain massive Tetradium, with microatolls confined to the highest cycle. The third highest cycle contains a Phytopsis (bundled tetradiid) biostrome and the next cycle down contains the finely-branching Rhabdotetradium. The occurrence of different tetradiids in successive cycles suggests a bathymetric gradient in tetradiid morphology with massive Tetradium in the shallowest settings and branching tetradiids in deeper settings. Recent scleractinian corals show a similar generalized bathymethic morphology gradient in many Indo-Pacific reefs. Pooleville Tetradium microatolls are the second oldest described metazoan microatolls, the oldest also being Tetradium
Keyword Microatoll
Tetradium
Ordovician
Bathymetry
Peritidal carbonates
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth Sciences Publications
 
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