Morphogenetic impact of microbial mats on surface structures of Kimmeridgian micritic limestones (Cerin, France)
作者:
P. BERNIER,
C. GAILLARD,
J. C. GALL,
G. BARALE,
J. P. BOURSEAU,
E. BUFFETAUT,
S. WENZ,
期刊:
Sedimentology
(WILEY Available online 1991)
卷期:
Volume 38,
issue 1
页码: 127-136
ISSN:0037-0746
年代: 1991
DOI:10.1111/j.1365-3091.1991.tb01858.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
ABSTRACTFor several years, palaeoecological research has been conducted on micritic limestones of late Kimmeridgian age in the southern Jura Mountains. The sedimentary environment is that of a lagoon with an irregular bottom, which was repeatedly exposed. Between two stages of lime deposition, a microbial mat grew over the muddy surface, giving cohesion to the sediment, restraining erosion and preserving fossil remains and reptile tracks. Various structures at the microbial mat surface can be observed: crescentic wavy, radial wavy, torn, petee and mixed structures. They imply the presence of desiccation periods and a slight bottom slope leading to a downward sliding of the microbial mat. Such features may also be generalized to explain superficial microbial structures of other shallow carbonate‐mud environment
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