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Early Cretaceous (Neocomian) microplankton from the Carpentaria Basin, northern Queensland
| Burger, D. | |
| 1980b | |
| Alcheringa vol.4 263-279 | |
| Early Cretaceous (Neocomian) microplankton from the Carpentaria Basin, northern Queensland |
Burger, D., 1980; Early Cretaceous (Neocomian) microplankton from the Carpentaria Basin, northern Queensland. Alcheringa vol.4: 263-279 The Neocomian upper Helby Beds, basal Rolling Downs Group and Gilbert River Formation of the Carpenteria Basin contain a dinoflagellate sequance divisible into three zonal intervals; the zones represent the oldest continuous marine Cretaceous record for eastern Australia. Zone DK1 (dated latest Jurassic to Berriasian) commences with the first appearance of four species, zone DK2 (dated Valangnian) with that of four or five species, and zone DK3 (dated Hauterivian) with that of three species. Biostratigraphic aspects are discussed of species selected as possible zone marker fossils in so far as they (a) are relatively poorly known, or represent new species, and (b) have no previously published Neocomian record. New combinations are proposed of one acritarch species and six dinoflagellate species. One new acritarch genus and species, Pseudofromea collaris, and four new dinoflagellate spcies - Canningia crassicingulata, Cleistosphaeridium australe, Cyclonephelium asymmetricum, and Muderongia testudinaria - are proposed and described.