Chitinozoa from the Early Devonian (Lochkovian–Pragian) Garra Limestone, central New South Wales, Australia

Winchester-Seeto, Theresa

doi:10.1017/s0022336000037033

Cited by 11 publications

(5 citation statements)

References 14 publications

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“…Extensive studies on the conodont faunas from Australia (Mawson, 1987;Mawson et al, 1988;Wilson, 1989) have pro vided the stratigraphic framework for dating the samples. The conodonts show that the samples examined for foraminiferal linings are of Lochkovian, Pragian, and Emsian ages, which is confirmed by the chitinozoan faunas (e.g., Winchester-Seeto, 1993).…”

Section: Geological Settingmentioning

confidence: 59%

Microforaminiferal linings from the Early Devonian of eastern Australia, and their generic placement

Winchester-Seeto

Bell

1994

J. Paleontol.

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Microforaminiferal linings assigned to 10 known genera have been recovered from Early Devonian (Lochkovian to Late Emsian) limestones from Victoria, New South Wales, and Queensland. These organic linings have been identified by comparison with normal-sized agglutinated foraminiferan genera known to occur in the associated sediments. Microforaminiferal linings with smooth walls and reticulate sculptured walls were present and the possible implications of these (diagenetic, relict structure, naked homeomorphs, or processing artifact) are discussed. Evidence is presented thatOrdovicinamay have a bilamellar organic wall lining.

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Section: Geological Settingmentioning

confidence: 59%

Microforaminiferal linings from the Early Devonian of eastern Australia, and their generic placement

Winchester-Seeto

Bell

1994

J. Paleontol.

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“…1979), molluscs (Hoare & Farrell 2004; Frýda & Farrell 2005), tentaculitids (Sherrard 1967), crinoids (Jell et al . 1988), foraminiferal linings (Winchester‐Seeto & Bell 1994) and chitinozoans (Winchester‐Seeto 1993). Specimens documented herein were acid‐processed in dilute (10%) hydrochloric acid at the Macquarie University Acid Leaching Facility by Brian D. Johnson in 1981 for his PhD dissertation research from two measured sections (sections G and GC in reference to the ‘Golf Course’), and additional material later recovered via resampling by students at the Macquarie University Centre for Ecostratigraphy and Palaeobiology (MUCEP) at the ‘Golf Course Revisited’ section (GCR in Fig.…”

Section: Geological Settingmentioning

confidence: 99%

Sclerite assembly, articulation and protective system of Lower Devonian machaeridians

Jacquet

Selly

Schiffbauer

et al. 2021

Papers in Palaeontology

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Machaeridians are a unique group of Palaeozoic annelids that secreted a calcitic armour consisting of dorsally interlocking sclerites running along the entire length of the animal. Preserved remains are most commonly found as disarticulated sclerites, although rare articulated specimens have also been preserved as moulds, recrystallized calcite and even pyrite replacement. These preservational modes unfortunately have obscured direct observation of the dorsal interlocking hinge, thus impeding our understanding of the functional protection offered by this biological armour. Herein, we document and describe articulated silicified lepidocoleids (Lepidocoleus caliburnus sp. nov., Lepidocoleus shurikenus sp. nov. and Lepidocoleus sp.) in association with isolated sclerites of Lepidocoleus cf. kuangguoduni from the Lower Devonian (Pragian) Garra Formation of New South Wales, Australia. Articulated specimens include straight and enrolled scleritome configurations possessing opposing and alternate dorsal hinge articulation, respectively. Silicified scleritomes were analysed using x‐ray microtomography to investigate the three‐dimensional morphology, cross‐sectional geometry and dorsal hinge articulation and configuration of individual sclerites in the armour assembly. Virtual dissection of articulated specimens alongside reconstructions of isolated sclerites reveal distinctions in sclerite morphology across opposing and alternate articulation mechanisms, including a novel system not previously observed in lepidocoleids. The combination of heterogeneous sclerite cross‐sectional geometry with sclerite overlap also serves to maintain a uniform thickness of the armour assembly and presumably improve resistance to predatory attack.

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“…It is characterized by grey to dark grey, highly fossiliferous limestones from a subtidal, shallow shelf. Studies of conodonts (Wilson, 1989) and chitinozoans (Winchester-Seeto, 1993b) provide a detailed biozonation for sections MUNG, RUN (pesavis Conodont Zone) and GCR (pesavis-sulcatus conodont zones). A section through the Martins Well Limestone Member of the Shield Creek Formation (MW) from the Broken River area of northern Queensland has been dated as spanning the pesavis-sulcatus conodont zones (Benson & Bear in Mawson et al, 1988), although all foraminiferal linings were recovered from the sulcatus Zone.…”

Section: Locality Information Early Devonianmentioning

confidence: 99%

Linings of agglutinated Foraminifera from the Devonian: taxonomic and biostratigraphic implications

Bell¹,

Winchester-Seeto

1999

J. Micropalaeontol.

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The organic linings of agglutinated foraminiferans from the Devonian are documented and described. These linings have been recovered in palynological residues from Australia, France, Pakistan and Siberia and range from the Lochkovian to the Frasnian. Six species are described as new:Hemisphaerammina coolamon, Psammosphaera garraay, Reophanus proavitus, Saccammina mea, Saccammina wingarri and Thurammina mirrka. Three species, with a wide geographical spread and a relatively limited stratigraphic range, may prove to have some utility in intercontinental correlation: Inauris tubulata Conkin & Conkin, Saccammina mea n. sp. and Saccammina wingarri n. sp.

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Chitinozoa from the Early Devonian (Lochkovian–Pragian) Garra Limestone, central New South Wales, Australia

Cited by 11 publications

References 14 publications

Microforaminiferal linings from the Early Devonian of eastern Australia, and their generic placement

Microforaminiferal linings from the Early Devonian of eastern Australia, and their generic placement

Sclerite assembly, articulation and protective system of Lower Devonian machaeridians

Linings of agglutinated Foraminifera from the Devonian: taxonomic and biostratigraphic implications

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