A new species of Lorrettina (dokimocephalid trilobite) from the Iverian (Cambrian, Jiangshanian) of the Amadeus Basin, Northern Territory, Australia

Abstract

A previously unreported dokimocephalid trilobite, Lorrettina waterhousei sp. nov., is described herein from the Iverian (Jiangshanian, Cambrian) upper Goyder Formation, Amadeus Basin, central Australia. This is the first definitive biostratigraphic evidence for rocks of an Iverian (Jiangshanian) age in the Amadeus Basin. Correlation is made with the Chatsworth Limestone (=Gola beds) of the neighbouring Georgina Basin in Australia, as well as internationally to China, based on the generic occurrence. The biostratigraphic age of the unit is also supported by previous carbon isotope chemostratigraphy, further strengthening the interpretation. Patrick M. Smith [Patrick.Smith@austmus.gov.au], Palaeontology Department, Australian Museum Research Institute, Sydney, New South Wales, 2010, Australia and, Department of Biological Sciences, Macquarie University, Sydney, New South Wales, 2109, Australia.