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New data on Hirnantian (latest Ordovician) postglacial carbonate rocks and fossils in northern Guizhou, Southwest China1.
- Source :
-
Canadian Journal of Earth Sciences . 2016, Vol. 53 Issue 7, p660-665. 6p. - Publication Year :
- 2016
-
Abstract
- The Kuanyinchiao Formation (Hirnantian, Upper Ordovician), yielding the typical Hirnantia fauna, has commonly been accepted as representing cool-water sediments deposited during the glacial interval in the Hirnantian Global Boundary Stratotype Section and Point (GSSP) region of South China. Recent investigation reveals that the uppermost carbonate-dominated part of this formation yields a warm-water rugose coral fauna with Silurian affinities at many localities of northern Guizhou Province, which substantially differs from the underlying cool-water fauna. This suggests that these carbonates were probably postglacial warm-water sediments, rather than having formed during the Hirnantian glacial interval as previously thought. Such a conclusion is consistent with the evidence from the associated brachiopod fauna, i.e., the Dalmanella testudinaria - Dorytreta longicrura community, which is similarly distinct from the underlying typical Hirnantia fauna. The sedimentological data show warm-water features at the same level (e.g., the presence of oolitic grains), also supporting this new interpretation. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ANIMALS
*SEDIMENTS
*SILURIAN Period
*CARBONATES
Subjects
Details
- Language :
- English
- ISSN :
- 00084077
- Volume :
- 53
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Canadian Journal of Earth Sciences
- Publication Type :
- Academic Journal
- Accession number :
- 116618299
- Full Text :
- https://doi.org/10.1139/cjes-2015-0197