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Keywords = Girvanella

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21 pages, 6554 KB  
Article
Microbial Carbonates of Upper Triassic Doi Long Formation, Lampang Group: A Study of New Outcrop Localities in Northern Lampang, Central North Thailand
by Kritsada Moonpa, Mongkol Udchachon, Jirattikarn Jainanta and Sathit Kanthata
Diversity 2025, 17(4), 299; https://doi.org/10.3390/d17040299 - 21 Apr 2025
Cited by 1 | Viewed by 1403
Abstract
The Doi Long Formation is the youngest record of Triassic deposits of the Lampang Group, Sukhothai Zone, central northern Thailand. The evolutionary history behind the presence of microbial limestone remains unknown, despite its high diversity and abundance in reef environments. This study documents [...] Read more.
The Doi Long Formation is the youngest record of Triassic deposits of the Lampang Group, Sukhothai Zone, central northern Thailand. The evolutionary history behind the presence of microbial limestone remains unknown, despite its high diversity and abundance in reef environments. This study documents new observations on the microbial carbonates of the Doi Long Formation in the northern Lampang Province. Eight new outcrop localities have been discovered and are analyzed in terms of sedimentological details. Microfacies description and fossil identification allow us to interpret the specific depositional environments of the bioconstructors of these mound-like build-ups. In the study localities, the Doi Long Formation consists of predominantly microbial carbonates, containing microproblematic organisms, microbialites (stromatolites), algae, and sponges. Five main microfacies are distinguished and several microproblematic organisms have been identified. The study localities yield microencrusters and microproblematica fossils, including Girvanella-like microstructures, Cladogirvanella, Garwoodia, Cayeuxia, Tubiphytes-like microorganisms, and shell fragments. Depositional environments corresponding to reef (mound-like microbial/microbialite build-ups) settings and lagoon environments have been proposed. Understanding the diversity within the Doi Long Formation is essential for clarifying the fossil assemblage and biological processes in reef ecosystems during the Late Triassic. Full article
(This article belongs to the Section Microbial Diversity and Culture Collections)
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15 pages, 30100 KB  
Article
Oolitic Limestone Induced by Photosynthetic Biofilms in the Xuzhuang Formation of Nangao Section, North China
by Ruoxiang Li
Minerals 2024, 14(2), 144; https://doi.org/10.3390/min14020144 - 29 Jan 2024
Cited by 1 | Viewed by 2379
Abstract
The role of biofilms in the formation of ooids is a focal point of current research. This study synthesizes macroscopic data with microscopic observations to analyze the depositional environment and genesis of oolitic limestone within the Xuzhuang Formation at the Nangao section. Notably, [...] Read more.
The role of biofilms in the formation of ooids is a focal point of current research. This study synthesizes macroscopic data with microscopic observations to analyze the depositional environment and genesis of oolitic limestone within the Xuzhuang Formation at the Nangao section. Notably, cerebroid ooids with unique cortical morphologies have been discovered. Within the nucleus, cortex, and the lumps among the ooids, a high-density preservation of Girvanella has been identified. Clotted micrite structures have also been observed within the filler content. The findings suggest that phototrophic biofilms have facilitated the formation of oolitic limestone in this profile, offering direct evidence for the connection between the festooned cortical morphologies and biofilms. This study further questions the interpretation of clotted micrite structures as sponge remains. These insights significantly enhance our understanding of the causal factors behind ooid formation. Full article
(This article belongs to the Special Issue Biomineralization in Prokaryotes and Eukaryotes)
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