ORCID Profile
0000-0002-4884-825X
Current Organisation
University of New England
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Palaeontology (incl. Palynology) | Geology
Expanding Knowledge in the Earth Sciences | Expanding Knowledge in the Biological Sciences |
Publisher: The Royal Society
Date: 19-08-2020
Abstract: Hyoliths (hyolithids and orthothecids) were one of the most successful early biomineralizing lophotrochozoans and were a key component of the Cambrian evolutionary fauna. However, the morphology, skeletogenesis and anatomy of earliest members of this enigmatic clade, as well as its relationship with other lophotrochozoan phyla remain contentious. Here, we present a new orthothecid, Longxiantheca mira gen. et sp. nov. preserved as part of secondarily phosphatized small shelly fossil assemblage from the lower Cambrian Xinji Formation of North China. Longxiantheca mira retains some ancestral traits of the clade with an undifferentiated disc-shaped operculum, a simple conical conch with apical septa and a two-layered microstructure of aragonitic fibrous bundles. The operculum interior exhibits impressions of soft tissues, including muscle attachment scars, mantle epithelial cells and a central kidney-shaped platform interpreted as a support structure in association with its presumptive feeding apparatus. The muscular system in orthothecids appears to be similar to that in hyolithids, suggesting a consistent anatomical configuration among the total group of hyoliths. The new finding of shell secreting cells demonstrates a mantle regulating the mode of growth for the operculum. Investigations of shell microstructures support the placement of hyoliths as total group molluscs with an unsettled position within the phylum Mollusca.
Publisher: Polska Akademia Nauk Instytut Paleobiologii (Institute of Paleobiology, Polish Academy of Sciences)
Date: 2019
Publisher: Informa UK Limited
Date: 11-12-2018
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 02-2016
Publisher: Cambridge University Press (CUP)
Date: 21-10-2016
DOI: 10.1017/S0016756816000704
Abstract: Correlation of lower Cambrian strata is often confounded by provincialism of key fauna. The widespread occurrence of the micromollusc Watsonella crosbyi Grabau, 1900 is therefore an important biostratigraphic signpost with potential for international correlation of lower Cambrian successions. Previous correlations of W. crosbyi from Australia (Normanville Group) suggested an Atdabanian- to Botoman-equivalent age. However, in the upper part of the Mount Terrible Formation, stratigraphic ranges of W. crosbyi and Aldanella sp. cf. golubevi overlap prior to the incoming of vertically burrowed ‘piperock’, which is indicative of an age no earlier than Cambrian Stage 2. The stratigraphic range of W. crosbyi in the Normanville Group, South Australia correlates with the ranges of the taxon in China, France, Mongolia and Siberia (though not Newfoundland). The new Australian data add further support for considering the first occurrence of W. crosbyi a good potential candidate for defining the base of Cambrian Stage 2. The stratigraphic range of W. crosbyi through the lower Cambrian Normanville Group has been determined based on collections from measured sections. Although rare, W. crosbyi is part of an assemblage of micromolluscs including Bemella sp., Parailsanella sp. cf. murenica and a sinistral form of Aldanella ( A. sp. cf. A. golubevi ). Other fauna present include Australohalkieria sp., Eremactis mawsoni , chancelloriids and Cupitheca sp.
Publisher: Elsevier BV
Date: 06-2022
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 11-2018
Publisher: Coquina Press
Date: 2020
DOI: 10.26879/943
Publisher: Elsevier BV
Date: 08-2016
Publisher: Cambridge University Press (CUP)
Date: 11-12-2020
DOI: 10.1017/S0016756820001260
Abstract: Major progress has recently been made regarding the biostratigraphy, lithostratigraphy and isotope chemostratigraphy of the lower Cambrian successions in South Australia, in particular of the Arrowie Basin, which has facilitated robust global stratigraphic correlations. However, lack of faunal and sedimentological data from the lower Cambrian Normanville Group in the eastern Stansbury Basin, South Australia – particularly the transition from the Fork Tree Limestone to the Heatherdale Shale – has prevented resolution of the age range, lithofacies, depositional environments and regional correlation of this succession. Here we present detailed sedimentologic, biostratigraphic and chemostratigraphic data through this transition in the eastern Stansbury Basin. Three lithofacies are identified that indicate a deepening depositional environment ranging from inner-mid-shelf (Lithofacies A and B) to outer shelf (Lithofacies C). New δ 13 C chemostratigraphic data capture global positive excursion III within the lower Heatherdale Shale. Recovered bradoriid Sinskolutella cuspidata supports an upper Stage 2 ( Micrina etheridgei Zone). The combined geochemistry and palaeontology data reveal that the lower Heatherdale Shale is older than previously appreciated. This integrated study improves regional chronostratigraphic resolution and interbasinal correlation, and better constrains the depositional setting of this important lower Cambrian package from the eastern Stansbury Basin, South Australia.
Publisher: Elsevier BV
Date: 07-2019
Publisher: Cambridge University Press (CUP)
Date: 22-02-2021
DOI: 10.1017/JPA.2020.117
Abstract: Diverse and abundant fossil taxa have been described in the lower Cambrian Shipai Formation in the Three Gorges area of Hubei Province, South China, but the taxonomy and ersity of the co-occurring brachiopod fauna are still far from clear. Here we describe the brachiopod fauna recovered from the Shipai Formation in the Three Gorges area of South China, including representatives of the subphylum Linguliformea: linguloids ( Lingulellotreta ergalievi , Eoobolus malongensis , and Neobolidae gen. indet. sp. indet.), and an acrotretoid ( Linnarssonia sapushanensis ) and representatives from the subphylum Rhynchonelliformea: the calcareous-shelled Kutorginates ( Kutorgina sinensis , Kutorgina sp., and Nisusia liantuoensis ). This brachiopod assemblage and the first occurrence of Linnarssonia sapushanensis shell beds permit correlation of the Shipai Formation in the Three Gorges area of Hubei Province with the Stage 4 Wulongqing Formation in the Wuding area of eastern Yunnan. This correlation is further strengthened by the first appearance datum (FAD) of the rhynchonelliform brachiopod Nisusia in the upper silty mudstone of both the Shipai and Wulongqing formations. The new well-preserved material, derived from siliciclastic rocks, also gives critical new insights into the fine shell structure of L . sapushanensis . Microstructural studies on micromorphic acrotretoids (like Linnarssonia ) have previously been restricted to fossils that were acid-etched from limestones. This is the first study to carry out detailed comparative ultrastructural studies on acrotretoid shells preserved in siliciclastic rocks. This work reveals a hollow tube and solid column microstructure in the acrotretoid shells from the Shipai Formation, which is likely to be equivalent of traditional column and central canal observed in shells dissolved from limestones.
Publisher: Polska Akademia Nauk Instytut Paleobiologii (Institute of Paleobiology, Polish Academy of Sciences)
Date: 2021
Publisher: Scandinavian University Press / Universitetsforlaget AS
Date: 10-2016
DOI: 10.1111/LET.12160
Publisher: Elsevier BV
Date: 11-2019
Publisher: Informa UK Limited
Date: 02-01-2014
Start Date: 2022
End Date: 12-2024
Amount: $386,762.00
Funder: Australian Research Council
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