Patterns of Ordovician Reef Development

Webby, Barry D.

doi:10.2110/pec.02.72.0129

Cited by 121 publications

(161 citation statements)

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“…Brenchley et al (1997) suggested that the Boda Limestone was Katian, but Webby (2002) indicated that the top of the Boda mounds stopped growth in the mid-Hirnantian. The species comes from the upper part or tops of the Boda mounds and should be of Hirnantian age.…”

Section: Genus Hindella Davidson 1882mentioning

confidence: 99%

Early athyride brachiopod evolution through the Ordovician-Silurian mass extinction and recovery, Anticosti Island, eastern Canada

Copper¹,

Jin²

2017

J. Paleontol.

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Abstract.-The subfamily Hindellinae is an early group of athyride brachiopods, characterized by a simple jugum that connects the laterally directed spiralia, which are disjunct from the crura. Four genera (Hindella, Cryptothyrella, Koigia, and Hyattidina) are reexamined on the basis of their internal structures, such as the crura and their connection to the hinge, the jugum, and spiralia. The internal brachidium and shell of the Aeronian genus Cryptothyrella differ substantially from those of Hindella. Elkanathyris pallula n. gen. n. sp. is recognized as a posteriorly ribbed hindellide of Aeronian age. These genera are transferred from the Meristellinae to the subfamily Hindellinae (family Hindellidae). On Anticosti Island, Hindella is confined to the Hirnantian (latest Ordovician): it became extinct at the end Ordovician during the last of several mass extinction events that also extinguished the Laframboise reefs at the top of the Ellis Bay Formation. Post-extinction recovery of athyrides was pioneered by small-shelled Koigia, which are abundant in the basal Silurian Becscie Formation. Hyattidina, with a simple brachidium, is abundant in the Aeronian and Telychian of Anticosti, but absent earlier. True meristellines, as envisioned here, first appeared in the Aeronian Gun River Formation. The revised taxonomy and stratigraphic ranges of these earliest athyrides shed light on the nature of the Ordovician-Silurian mass extinction and recovery, and help refine the biostratigraphy of the O-S boundary interval.

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Section: Genus Hindella Davidson 1882mentioning

confidence: 99%

Early athyride brachiopod evolution through the Ordovician-Silurian mass extinction and recovery, Anticosti Island, eastern Canada

Copper¹,

Jin²

2017

J. Paleontol.

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“…이후 캄브리아기 중-후기(Series 3-Furongian)에는 주로 미생물들이 생물초를 형성한 것 으로 알려져 왔으나 (Rowland and Shapiro, 2002), 최근 이 시기의 미생물초에 상당량의 해면동물이 포 함되어 있음이 밝혀지며 이들을 해면동물-미생물초로 재해석할 가능성이 제기되었다 (Hong et al, 2012;Kruse and Reitner, 2014;Lee et al, 2014aLee et al, , 2015c (Adachi et al, 2011;Hong et al, 2015). 오르도비스기 중기에서 후기에는 후생동물들 이 미생물의 도움 없이도 생물초를 만들게 됨에 따라 미생물암의 비중이 급격하게 감소하였다 (Webby, 2002). 이후 미생물암은 데본기까지 그 비중이 작았 던 것으로 알려졌다.…”

Section: 지질시대에서 나타나는 미생물암unclassified

A Review on Microbialites: a Korean Perspective

Lee¹

2015

The Journal of the Petrological Society of Korea

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Microbialites are defined as rocks formed by microbial organisms. After their first appearance around 3.5 billion years ago, microbialites occur in various depositional environments throughout geological periods. Microbial organisms form microbialites by trapping and binding detrital sediments and/ or precipitating carbonate cements, resulting in formation of various microstructures and mesostructures. Four major types of microbialites are distinguished based on their mesostructures: stromatolite, thrombolite, dendrolite, and leiolite. In the geological records, occurrences of microbialites are influenced by calcium carbonate saturation of seawater and interaction of microbialites with metazoans. Stromatolites mainly flourished during the Precambrian, and diminished as level of atmospheric carbon dioxide declined. On the other hand, thrombolites, mainly formed by calcified microbes, began to flourish from the Neoproterozoic. As metazoans diversified in the Phanerozoic, proportion of the microbialites within sedimentary record declined. Since then, microbialites only occasionally flourished during the Phanerozoic, such as shortly after mass-extinction events. In the Korean Peninsula, microbialites occur in the Neoproterozoic Sangwon System, the Early Paleozoic Joseon Supergroup, and the Cretaceous Gyeongsang Supergroup, which form different shapes according to their age and depositional environments. By performing detailed studies on these Korean microbialites, it is possible to understand how microbes affected geological records and sedimentary environments, as well as their interaction with other organisms.

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“…Algal elements of Epiphyton, Frutexites, Rivularia, Dasycladus-solenoporaceae, and Actinophycus formed phylloid-shaped bafflestones and bindstones [32]. Webby [15] considered that these were more likely mat-like growths formed by Trichonophyton.…”

Section: Temporal and Spatial Distribution And Reef Components 1soutmentioning

confidence: 99%

“…Reefs dominated by stromatolites and thrombolites are represented by the Nantsinkuan Formation, Songzi, Hubei [18], the Lunshan Formation, Shitai [16], and the Hunghuayuan Formation, Dongzhi, southern Anhui [25,47]. Green algae and red algae with calcified cytoderms could baffle and bind particles, and their lithological proportions rose steadily from the Darriwilian period [15]. Calcareous algae, however, reinforced reef-building in China until the Late Ordovician [28,30,42,45].…”

Section: Succession Of the Reef-building Taxamentioning

confidence: 99%

“…The Gondwana margin, Laurentia, and Siberia have preserved the majority of the approximately 200 recorded Ordovician reefs [13,14]. About 40 are well represented in the South China, Tarim, and North China blocks [15]. An updated global Ordovician division scheme and a database concerning this theme pro-vide the possibility of reconstructing the scenario of reef succession in China.…”

mentioning

confidence: 99%

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