Organic‐walled microphytoplankton and chitinozoans from the middle Devonian (Givetian) Boyle dolomite of Kentucky, U.S.A.

Wood, Gordon D.; Clendening, John A.

doi:10.1080/01916122.1985.9989292

Cited by 17 publications

(2 citation statements)

References 9 publications

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“…Our identification of only three species (two algae and one acritarch species) in our material contrasts markedly with the much greater diversity of algae and acritarchs seen in other Devonian microfloras of the Appalachian and associated basins (e.g., 10 species in the Upper Devonian-Lower Mississippian section of Ohio [56]; 19 species in the Lower Devonian Kalkberg Limestone of New York [80]; 26 species in the Givetian Boyle Dolomite of Kentucky [81]). This situation with our material may be artifactual in the sense that our restrictive rock sampling regimen under-represents true Tully diversity, or that the loss of taxonomically significant morphologic and biochemical details resulting from post-mortem mineralization of the Tully microfossils masks a wider actual diversity.…”

Section: Algae and Acritarchscontrasting

confidence: 44%

A Mineralized Alga and Acritarch Dominated Microbiota from the Tully Formation (Givetian) of Pennsylvania, USA

Chamberlain

Brown

2016

Geosciences

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Sphaeromorphic algal cysts, most probably of the prasinophyte Tasmanites, and acanthomorphic acritarch vesicles, most probably Solisphaeridium, occur in a single 20 cm thick bed of micritic limestone in the lower part of the Middle Devonian (Givetian) Tully Formation near Lock Haven, Pennsylvania. Specimens are composed of authigenic calcite and pyrite crystals about 5-10 µm in length. Some specimens are completely calcitic; some contain both pyrite and calcite; and many are composed totally of pyrite. The microfossils are about 80 to 150 µm in diameter. Many show signs of originally containing a flexible wall composed of at least two layers. Some appear to have been enclosed in a mucilaginous sheath or membrane when alive. The acanthomorphic forms have spines that are up to 20 µm in length, expand toward the base, and are circular in cross-section. The microflora occurs with microscopic molluscs, dacryoconarids, the enigmatic Jinonicella, and the oldest zooecia of ctenostome bryozoans known from North America. The microalgal horizon lacks macrofossils although small burrows are present. Microalgae and acritarchs have been preserved via a complex preservational process involving rapid, bacterially-mediated post-mortem mineralization of dead cells. The microfossil horizon, and possibly much of the Tully Formation at Lock Haven with similar lithology, formed in a relatively deep, off-shore basin with reduced oxygen availability in the substrate.

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Section: Algae and Acritarchscontrasting

confidence: 44%

A Mineralized Alga and Acritarch Dominated Microbiota from the Tully Formation (Givetian) of Pennsylvania, USA

Chamberlain

Brown

2016

Geosciences

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“…2, figs 1–16.1985 Fungochitina pilosa Collinson & Scott; Paris in Paris et al ., pl. 28, figs 3–6, 10a–b.?1986 Sphaerochitina pilosa Collinson & Scott; Wood, pl. 2, figs 8–9.?1987 Fungochitina pilosa Collinson & Scott; Boumendjel, pp.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

Chitinozoan response to the ‘Kellwasser events’: population dynamics and morphological deformities across the Frasnian–Famennian mass extinction

De Backer,

Day,

Emsbo

et al. 2024

Papers in Palaeontology

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Fossil (zoo)plankton dynamics during Devonian ocean‐anoxic and extinction events can shed light on the palaeoceanographic and geochemical processes that shaped the middle Palaeozoic biosphere. However, datasets on (Upper) Devonian marine palynology, illustrating such dynamics, remain underexplored. The type section of the Sweetland Creek Shale in Iowa (USA) offers a detailed conodont zonation for the upper Frasnian and across the Frasnian–Famennian boundary, records the Upper and Lower Kellwasser events and has pristine preservation of organic material, making this an ideal section to study the effects of this catastrophic event on chitinozoan zooplankton populations. A total of 3998 specimens were recovered, imaged and classified into 12 distinct species, 10 of which were previously unknown. This study demonstrates the unrealized potential of chitinozoans as a regional biostratigraphic tool in the Upper Devonian. The Lower Kellwasser Event is characterized by a drop in chitinozoan abundance and the run up to the Upper Kellwasser Event marks a period of rapid species turnover rates. Interestingly, every assemblage in this interval is nearly monospecific. Patterns of changing spine morphologies in Fungochitina pilosa, Ramochitina sp. A and Saharochitina sp. A are herein explored as potential ecophenotypic expressions. We identify Angochitina monstrosa as a new disaster species. The discovery of two teratological chitinozoans specimens, in combination with the presence of the disaster species Angochitina monstrosa and deformation in contemporaneous conodonts, supports our previous discovery that marine teratology is a feature of many Palaeozoic extinction events, possibly triggered by the injection of hydrothermal brines into the ocean.

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Biostratigraphic and paleogeographic significance of a palynological assemblage from the Middle Devonian Ulusubasite Formation, eastern Junggar Basin, Xinjiang, China

Zhu¹,

Wicander²,

Marshall³

2008

Review of Palaeobotany and Palynology

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Organic‐walled microphytoplankton and chitinozoans from the middle Devonian (Givetian) Boyle dolomite of Kentucky, U.S.A.

Cited by 17 publications

References 9 publications

A Mineralized Alga and Acritarch Dominated Microbiota from the Tully Formation (Givetian) of Pennsylvania, USA

A Mineralized Alga and Acritarch Dominated Microbiota from the Tully Formation (Givetian) of Pennsylvania, USA

Chitinozoan response to the ‘Kellwasser events’: population dynamics and morphological deformities across the Frasnian–Famennian mass extinction

Biostratigraphic and paleogeographic significance of a palynological assemblage from the Middle Devonian Ulusubasite Formation, eastern Junggar Basin, Xinjiang, China

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