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Abstract
Earp, C., 29 January 2019. Costulatotheca schleigeri (Hyolitha: Orthothecida) from the Walhalla Group (Early Devonian) at Mount Pleasant, central Victoria, Australia. Alcheringa. Alcheringa 43, 220–227. ISSN 0311-5518
A number of hyolith fragments (including one operculum), found in Early Devonian marine turbidites at Mt Pleasant, near Alexandra, central Victoria, are described as Costulatotheca schleigeri gen. et sp. nov., the first confirmed record of the order Orthothecida in the Devonian of Australia. Index fossils found at this locality (Uncinatograptus sp. cf. U. thomasi and Nowakia sp. ex gr. N. acuaria) indicate an age of Pragian or earliest Emsian. The taphonomy of rare rafted shelly fossils indicates that flysch deposition occurred in a very-low-energy environment into which there were occasional bursts of high-energy turbidites carrying allochthonous fossils from shallower water.
Clement Earp [[email protected]], 1 De Havilland Place, Onerahi, Whangarei 0110, New Zealand.
Acknowledgements
Melody Pepper assisted with the collection of specimens and measurements at the site over a number of visits. Frank Holmes kindly photographed the dacryoconarid specimen. I also thank John Malinky for his comments on the orthothecids, and the anonymous reviewers for their suggestions, which materially improved this paper.
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