Early Cambrian chronostratigraphy and geochronology of South Australia
نویسندگان
چکیده
منابع مشابه
The scleritome of Paterimitra: an Early Cambrian stem group brachiopod from South Australia.
Early Cambrian tommotiids are problematic fossil metazoans with external organophosphatic sclerites that have been considered to be basal members of the lophophorate stem group. Tommotiids are almost exclusively known from isolated or rarely fused individual sclerites, which made previous reconstructions of the actual organism highly conjectural. However, the recent discovery of the first artic...
متن کاملRevision of the Early Cambrian Tommotiid Kulparina Rostrata from South Australia
The early Cambrian (Terreneuvian, Stage 2) tommotiid Kulparina rostrata Conway Morris and Bengtson in Bengtson et al., 1990 is revised. The pyramidal sclerites of K. rostrata are shown to be bilaterally symmetrical and homologues of the symmetrical S1 sclerites of Paterimitra pyramidalis Laurie, 1986. The scleritome of K. rostrata is also shown to include flattened asymmetrical sclerites that w...
متن کاملThe first tunicate from the Early Cambrian of South China.
Here we report the discovery of eight specimens of an Early Cambrian fossil tunicate Shankouclava near Kunming (South China). The tunicate identity of this organism is supported by the presence of a large and perforated branchial basket, a sac-like peri-pharyngeal atrium, an oral siphon with apparent oral tentacles at the basal end of the siphonal chamber, perhaps a dorsal atrial pore, and an e...
متن کاملEarly Cambrian Pentamerous Cubozoan Embryos from South China
BACKGROUND Extant cubozoans are voracious predators characterized by their square shape, four evenly spaced outstretched tentacles and well-developed eyes. A few cubozoan fossils are known from the Middle Cambrian Marjum Formation of Utah and the well-known Carboniferous Mazon Creek Formation of Illinois. Undisputed cubozoan fossils were previously unknown from the early Cambrian; by that time ...
متن کاملIntegrated chronostratigraphy of Proterozoic-Cambrian boundary beds in the western Anabar region, northern Siberia.
Carbonate-rich sedimentary rocks of the western Anabar region, northern Siberia, preserve an exceptional record of evolutionary and biogeochemical events near the Proterozoic/Cambrian boundary. Sedimentologically, the boundary succession can be divided into three sequences representing successive episodes of late transgressive to early highstand deposition; four parasequences are recognized in ...
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ژورنال
عنوان ژورنال: Earth-Science Reviews
سال: 2018
ISSN: 0012-8252
DOI: 10.1016/j.earscirev.2018.06.005