Refined age and geological context of two of Australia’s most important Jurassic vertebrate taxa (Rhoetosaurus brownei and Siderops kehli), Queensland

Todd, C. N.; Roberts, Eric M.; Knutsen, Espen M.; Rozefelds, Andrew C.; Huang, Hongyan; Spandler, Carl

doi:10.1016/j.gr.2019.05.008

Cited by 23 publications

(3 citation statements)

References 23 publications

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“…For each sample, individual zircons were picked from the heavy concentrates under a binocular microscope, mounted using epoxy resin, polished to expose the zircons, and then imaged using a SEM with cathodoluminescence detector (CL) to identify the best grains and locations for analyses. U-Pb geochronology was performed using laser ablation (LA)-ICPMS on a Teledyne Analyte G2 193 nm Excimer Laser with HeLex II Sample Cell and a Thermo iCAP-RQ ICP-MS at the AAC at JCU (see Todd et al, 2019 for lab details). A 30 µm spot size was used for all analyses, and individual analyses were bracketed and checked by analyzing primary and secondary standards following every 10-12 analyses.…”

Section: U-pb Detrital Zircon Dating Methodsmentioning

confidence: 99%

New age constraints support a K/Pg boundary interval on Vega Island, Antarctica: Implications for latest Cretaceous vertebrates and paleoenvironments

et al. 2022

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A second K/Pg boundary interval in the northern sector of the Antarctic Peninsula on Vega Island has been proposed, yet current temporal resolution of these strata prohibits direct testing of this hypothesis. To not only test for the existence of a K/Pg boundary on Vega Island but also provide increased age resolution for the associated vertebrate fauna (e.g., marine reptiles, non-avian dinosaurs, and avian dinosaurs), the Vega Island succession was intensively re-sampled. Stratigraphic investigation of the Cape Lamb Member of the Snow Hill Island Formation, and in particular, the overlying Sandwich Bluff Member of the López de Bertodano Formation, was conducted using biostratigraphy, strontium isotope stratigraphy, magnetostratigraphy, and detrital zircon geochronology. These data indicate a Late Campanian−early Maastrichtian age for the Cape Lamb Member and present three possible correlations to the global polarity time scale (GPTS) for the overlying Sandwich Bluff Member. The most plausible correlation, which is consistent with biostratigraphy, detrital zircon geochronology, sequence stratigraphy, and all but one of the Sr-isotope ages, correlates the base of the section to C31N and the top of the section with C29N, which indicates that the K/Pg boundary passes through the top of the unit. A second, less plausible option conflicts with the biostratigraphy and depends on a series of poorly defined magnetic reversals in the upper part of the stratigraphy that also correlates the section between C31N and C29R and again indicates an inclusive K/Pg boundary interval. The least likely correlation, which depends on favoring only a single Sr-isotope age at the top of the section over biostratigraphy, correlates the section between C31N and C30N and is inconsistent with an included K/Pg boundary interval. Although our preferred correlation is well supported, we failed to identify an Ir-anomaly, spherules/impact ejecta, or other direct evidence typically used to define the precise position of a K/Pg boundary on Vega Island. This study does, however, confirm that Vegavis, from the base of the Sandwich Bluff Member, is the oldest (69.2−68.4 Ma) phylogenetically placed representative of the avian crown clade, and that marine vertebrates and non-avian dinosaurs persisted in Antarctica up to the terminal Cretaceous.

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Section: U-pb Detrital Zircon Dating Methodsmentioning

confidence: 99%

New age constraints support a K/Pg boundary interval on Vega Island, Antarctica: Implications for latest Cretaceous vertebrates and paleoenvironments

et al. 2022

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“…The comparisons below are restricted to vertebrae from the anterior-to-middle part of the dorsal series. For this reason, we exclude from comparisons several pre-Late Jurassic sauropods for which there are no dorsal vertebrae or for which no information is available, such as Vulcanodon (Africa) or Nebulasaurus , Chinshakiangosaurus , and Anhuilong (Asia), as well as sauropods whose age assignments have been moved forward into the Late Jurassic, such as Shunosaurus (Oxfordian; Wang et al, 2018; but see Zhou et al, 2022) and Rhoetosaurus (early Oxfordian or younger; Todd et al, 2019).…”

Section: Comparisons With Other Early–middle Jurassic Sauropodsmentioning

confidence: 99%

A sauropod from the Lower Jurassic La Quinta Formation (Dept. Cesar, Colombia) and the initial diversification of eusauropods at low latitudes

Rincón

Pájaro

Velandia

et al. 2022

Journal of Vertebrate Paleontology

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“…All U-Pb LA-ICPMS analyses were conducted using a Teledyne Analyte G2 193 nm Excimer Laser with HeLex II Sample Cell and a Thermo iCAP-RQ ICP-MS. The analytical details and instrument setup used is comprehensively described in Todd et al (2019) and Foley, Henderson, et al (2021). A 30-µm spot size was applied across all analyses.…”

Section: Detrital Zircon U-pb Geochronologymentioning

confidence: 99%

Deciphering Late Cretaceous palaeo‐river catchments in eastern Australia: Recognition of distinct northern and southern drainage basins

2021

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During the Early Cretaceous, Australia was flooded by the epicontinental Eromanga Sea, deposits of which occur across the Great Australian Superbasin. However, the mid‐Cretaceous retreat of this shallow sea, and the resultant palaeogeographic and sediment distribution patterns, are poorly understood. This study chronicles the Eromanga Sea's northward regression through the Carpentaria Basin as captured in the sedimentary record of the Normanton Formation. We achieve this by integrating sedimentary facies analysis of cores from across the Carpentaria Basin with palynology, sandstone petrography and U‐Pb detrital zircon geochronology. Results indicate that the Normanton Formation was deposited between ca. 100 and 96 Ma, and that it represents a large, northward‐prograding, likely river‐dominated delta system. The unit's volcanoclastic nature is exhibited through abundant lithic volcanics and devitrified glass, with a prominent, near‐depositional detrital zircon population attributed to a proximal continental magmatic arc‐derived source hypothesised to parallel the eastern seaboard of Australia at this time. The Normanton Formation is temporally correlative with the lower‐middle portions of the similarly volcanoclastic Winton Formation in the Eromanga Basin, which drained southwards into the Cenomanian‐Santonian Ceduna River Delta system. However, Normanton Formation strata display subtly different provenance signatures and drainage patterns, indicating input from similar, but likely more northern source terrains than much of the contemporaneous Winton Formation. These sediments were unlikely recycled southwards into the Ceduna Delta like those of the Winton Formation; rather they drained northward following the retreat of the Eromanga Sea through the Carpentaria Basin, indicating a Cretaceous drainage divide between two river systems, with distinct northern and southern drainage catchments. The mid‐Cretaceous palaeogeography of eastern Australia is analogous to that of the Late Cretaceous Western Interior Seaway of North America, in which the retreat of a shallow epicontinental sea is marked by the rapid deposition and progradation of multiple large, geographically distinct clastic wedges.

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Refined age and geological context of two of Australia’s most important Jurassic vertebrate taxa (Rhoetosaurus brownei and Siderops kehli), Queensland

Cited by 23 publications

References 23 publications

New age constraints support a K/Pg boundary interval on Vega Island, Antarctica: Implications for latest Cretaceous vertebrates and paleoenvironments

New age constraints support a K/Pg boundary interval on Vega Island, Antarctica: Implications for latest Cretaceous vertebrates and paleoenvironments

A sauropod from the Lower Jurassic La Quinta Formation (Dept. Cesar, Colombia) and the initial diversification of eusauropods at low latitudes

Deciphering Late Cretaceous palaeo‐river catchments in eastern Australia: Recognition of distinct northern and southern drainage basins

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