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Integrated chronostratigraphy of the lower Cambrian Byrd Group, Transantarctic Mountains
- Betts, Marissa J (author)
- Claybourn, Thomas M (author)
- Holmer, Lars E (author)
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- Skovsted, Christian B (author)
- Myrow, Paul M (author)
- Stemmerik, Lars (author)
- Topper, Timothy P (author)
- Park, Tae-Yoon (author)
- Hughes, Nigel C (author)
- Brock, Glenn A (author)
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- English.
- Other publication (other academic/artistic)
Abstract
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- Antarctica and Australia were sutured together straddling the equator during the major pulse of animal biodiversification associated with the Cambrian radiation. However, lack of detailed systematic sampling of lower Cambrian sedimentary packages from Antarctica has significantly impeded precise age determination and correlation with other Cambrian paleocontinents, especially with other parts of East Gondwana. Here were present new, integrated biostratigraphic and chemostratigraphic (δ13C isotopes) data from three stratigraphic sections measured through autochthonous shallow water carbonates (including archaeocyath-microbial bioherms) from the lower Cambrian Byrd Group in the Transantarctic Mountains. Recovered shelly fossil assemblages (brachiopods, tommotiids, molluscs, trilobites) from the Holyoake and Churchill Ranges include conspecific taxa previously described from Hawker Group rocks in the Arrowie Basin of South Australia facilitating direct correlation with the upper Dailyatia odyssei biozone. Synchronous chemostratigraphic data capture a distinctive positive ?13C excursion in the Churchill Range interpreted as the global Mingxinsi Carbon Isotope Excursion (MICE) peak. A succeeding gradual negative ?13C excursion captured in the Churchill and Holyoake sections is interpreted as the global Archaeocyathid Extinction Carbon Isotope Excursion (AECE) event. There is no chemostratigraphic evidence for the large Redlichiid-Olenellid Extinction Carbon Isotope Excursion (ROECE) negative event that straddles and defines the Cambrian Stage 4 – Miaolingian boundary. Hence, the integrated faunal and new chemostratigraphic data presented herein strongly support a Cambrian Stage 4 age for the upper Shackleton Limestone – Holyoake Formation – Starshot Formation succession of the Byrd Group.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
Keyword
- Cambrian Series 2
- East Antarctica
- Biostratigraphy
- Chemostratigraphy
- Carbon Isotopes
Publication and Content Type
- vet (subject category)
- ovr (subject category)
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- Betts, Marissa J
- Claybourn, Thoma ...
- Holmer, Lars E
- Skovsted, Christ ...
- Myrow, Paul M
- Stemmerik, Lars
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- Topper, Timothy ...
- Park, Tae-Yoon
- Hughes, Nigel C
- Brock, Glenn A
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- NATURAL SCIENCES
- NATURAL SCIENCES
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- Uppsala University
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