The formation conditions of the burial site of Late Cretaceous dinosaurs and plants in the Kakanaut River basin (Koryak Highlands, Northeastern Asia)

Shczepetov, S. V.; Herman, Alexei B.

doi:10.1134/s0869593817040050

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…The bone-bearing layers are either dated as (1) early late Maastrichtian considering that the formation is underlain by marine deposits of late Maastrichtian age and overlain by marine sediments of the Kokuy Unit, which contain poorly preserved plant fossils and the latest Maastrichtian invertebrate fauna [10,37,38] or (2) late Campanian-early Maastrichtian considering that underlying and overlapping deposits do not directly contact marine layers containing stratigraphically important forms of mollusk fossils. Furthermore, the dinosaur remains were found together with plant representative of the Kakanaut flora, allowing the assignment of the bone-and plantbearing layers to the Gornaya River phytostratigraphic horizon dated as late Campanian, possibly early Maastrichtian [39]. During the latest Cretaceous, the Koryak Upland region was situated at a paleolatitude of about 75 • N [40] (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

High-Latitude Dinosaur Nesting Strategies during the Latest Cretaceous in North-Eastern Russia

et al. 2023

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Dinosaur eggshell fragments attributed to the oofamilies Spheroolithidae and Prismatoolithidae and recovered from the latest Cretaceous Kakanaut Formation of North-eastern Russia (Chukotka) constitute one of the northernmost records of dinosaur reproductive behaviors. The high palaeolatitude of the locality (~75° N), as well as the cool near-polar climate, where summer temperatures only averaged 20 °C during the warmest month, dark near-freezing winters and egg incubation that could have lasted several months, raise questions about dinosaur reproductive strategies, particularly in terms of the timing of egg laying. In order to investigate seasonal aspects of Kakanaut dinosaur reproductions, carbonate from eggshell fragments have been analyzed for their oxygen and carbon isotope compositions, along with the oxygen and carbon isotope compositions of apatite phosphate and structural carbonate of associated theropod, hadrosaur and ankylosaur teeth as well as lepisosteid fish scales. Stable oxygen and carbon isotope compositions of eggshells from the Kakanaut Formation together with those of associated adult dinosaur teeth and fish scales reveal differences in mineralization timing between eggshells and teeth and show that eggs were laid at the very beginning of spring when snowmelt drained from nearby highlands. We propose that Kakanaut dinosaurs laid their eggs at the very beginning of spring in order to accommodate an incubation period that lasted several months. This timing would also benefit from mild temperatures and increasing food availability when the eggs hatch, allowing the hatchlings to grow large enough to survive the next winter or perhaps follow adult animals in their migration southwards.

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Section: Methodsmentioning

confidence: 99%

High-Latitude Dinosaur Nesting Strategies during the Latest Cretaceous in North-Eastern Russia

et al. 2023

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New insights into the thermal regime and hydrodynamics of the early Late Cretaceous Arctic

et al. 2019

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The Arctic is warming faster than anywhere else of comparable size on Earth, impacting global climate feedbacks and the Arctic biota. However, a warm Arctic is not novel. The Late Cretaceous fossil record of the region enables a detailed reconstruction of polar environmental conditions, and a thriving extinct ecosystem, during a previous 'hothouse’ global climate. Using leaf form (physiognomy) and tree ring characteristics we reconstruct Cenomanian to Coniacian polar thermal and hydrological regimes over an average annual cycle at eight locations in NE Russia and northern Alaska. A new high spatial resolution (∼1 km) WorldClim2 calibration of the Climate Leaf Analysis Multivariate Program (CLAMP) yields results similar to, but often slightly warmer than, previous analyses, but also provides more detailed insights into the hydrological regime through the return of annual and seasonal vapour pressure deficit (VPD), potential evapotranspiration (PET) estimates and soil moisture, as well as new thermal overviews through measures of thermicity and growing degree days. The new results confirm the overall warmth of the region, particularly close to the Arctic Ocean, but reveal strong local differences that may be related to palaeoelevation in the Okhotsk–Chukotka Volcanogenic Belt in NE Russia. While rainfall estimates have large uncertainties due to year-round wet soils in most locations, new measures of VPD and PET show persistent high humidity, but with notably drier summers at all the Arctic sites.

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On the Problem of Nonmarine Cretaceous Strata Correlation in the Northeast Russia: The Conditions of Florogenesis in Volcanic Areas

Shczepetov

Neshataeva

2019

Stratigr. Geol. Correl.

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The formation conditions of the burial site of Late Cretaceous dinosaurs and plants in the Kakanaut River basin (Koryak Highlands, Northeastern Asia)

Cited by 4 publications

References 2 publications

High-Latitude Dinosaur Nesting Strategies during the Latest Cretaceous in North-Eastern Russia

High-Latitude Dinosaur Nesting Strategies during the Latest Cretaceous in North-Eastern Russia

New insights into the thermal regime and hydrodynamics of the early Late Cretaceous Arctic

On the Problem of Nonmarine Cretaceous Strata Correlation in the Northeast Russia: The Conditions of Florogenesis in Volcanic Areas

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