Taxonomy, biostratigraphic and paleoecological aspects of non-marine ostracod fauna from the Jinju Formation (Albian) of the Gyeongsang Basin, South Korea

Choi, Byung-Do; Jia, Baoyan; Huh, Min; Jung, Jongyun; Wang, Yaqiong

doi:10.1016/j.cretres.2021.104944

Cited by 9 publications

(7 citation statements)

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“…2H). The color of the eggshell is light brown, lighter than the color of other Late Cretaceous eggs reported from Korea (e.g., S. Choi et al, 2021; Huh et al, 2006).…”

Section: Systematic Paleontologymentioning

confidence: 66%

“…Considering that fish (H.-M. Kim et al, 2014; Yabumoto et al, 2006), ostracods (B.D. Choi & Huh, 2016; B.-D. Choi et al, 2021), and isopods (Park et al, 2012) characterize the overlying lacustrine Jinju Formation, the paleoecology of the fossil locality (Figs. 8, ) was analogous to that of the Jinju Formation.…”

Section: Discussionmentioning

confidence: 99%

“…We followed the established protocol of S. Choi et al (2021). Before coating the EBSD specimen with carbon, 44 Raman spectra were obtained from the EBSD specimen to assess the thermal maturity of the organic matter in the eggshells.…”

Section: Methodsmentioning

confidence: 99%

“…PKNU GH14-E yields a very well-developed graphite band (G-band; ∼1580 cm –1 ) and disordered band (D-band; ∼1340–1360 cm –1 ) (Fig. 7), which are signs of thermally altered organic matter (Buseck & Beyssac, 2014; S. Choi et al, 2021; S. Choi, Yang et al, 2022; Henry et al, 2019; contra Norell et al, 2022).…”

Section: Systematic Paleontologymentioning

confidence: 99%

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Turtle eggs from the Lower Cretaceous Hasandong Formation (South Korea) with relict aragonite under significant thermal maturity

Choi

Kim

Paik

et al. 2022

Journal of Vertebrate Paleontology

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Unlike the eggshells of other amniotes, turtle eggshells are composed of aragonite, which is a metastable mineral. Turtle eggshells in the fossil record are therefore usually transformed to calcite. Geothermal heat also negatively affects the preservation of aragonite, and therefore the preservation of aragonite under geothermal settings is not usually expected. Here we report new turtle eggs from the Lower Cretaceous (Aptian–Albian) Hasandong Formation of South Korea, describing the morphological features of the eggs and eggshells. The eggs belong to an oogenus Testudoolithus with the smallest recorded egg size. As one of the oldest fossil eggs from Korea, this material fills a paleobiogeographic gap in the fossil record of turtle eggs in East Asia, which has limited records for the eggs of non-dinosaurian reptiles. More importantly, the presence of relict aragonite was cross-validated by electron backscatter diffraction and Raman spectroscopy. The Raman spectra of the thermally altered organic matter inside the eggshells indicated that the eggs experienced a maximum temperature of almost 260°C during their taphonomic history. This implies that aragonite can be preserved even under hostile thermal conditions and earlier reports of ‘calcite-only’ turtle fossil eggs may preserve undetected relict aragonite, which is only detectable via careful investigation using advanced microscopic techniques. The combined use of mineralogical and spectroscopic approaches adopted in this study may also be useful to invertebrate paleontology and archeology to further understand the relationship between the preservation of aragonite and the maximum paleotemperature that the materials experienced.

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“…2H). The color of the eggshell is light brown, lighter than the color of other Late Cretaceous eggs reported from Korea (e.g., S. Choi et al, 2021; Huh et al, 2006).…”

Section: Systematic Paleontologymentioning

confidence: 66%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Systematic Paleontologymentioning

confidence: 99%

See 2 more Smart Citations

Turtle eggs from the Lower Cretaceous Hasandong Formation (South Korea) with relict aragonite under significant thermal maturity

Choi

Kim

Paik

et al. 2022

Journal of Vertebrate Paleontology

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“…Cypridea verrucata is distributed in the Barremian to Aptian strata of Mongolia (Neustrueva, 1974; Neustrueva et al, 2005; this study). Species of Candona and Trapezoidella are commonly reported from the Lower Cretaceous Strata of East Asia (Hou et al, 2002; Neustrueva et al, 2005; Wang et al, 2015, 2016; Choi et al, 2017, 2020, 2021). Consequently, we assign a Barremian–Aptian age for the Shinekhudag Formation in Gobi–Altai area (Fig.…”

Section: Discussionmentioning

confidence: 99%

Nonmarine ostracod fauna from the Lower Cretaceous Shinekhudag Formation (southwest Mongolia): taxonomy, biostratigraphy, and paleoecology

Choi

Wang²

2023

J. Paleontol.

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This work provides the detailed investigation (taxonomy, biostratigraphy, and paleoecology) of a nonmarine ostracod fauna from the Shinekhudag Formation in Gobi–Altai area, southwest Mongolia. The samples from two sections (Tsagaan Tsuvarga and Oshih Hollow East) yielded various ostracods assigned to nine species belonging to six genera: Cypridea verrucata Neustrueva, 1974, C. ihsienensis Hou, 1958, C. unicostata Galeeva, 1955, C. tumefacta Neustrueva, 1974, Yumenia cf. Y. oriformis Hou, 1958, Scabriculocypris subscalara Zhang and Chen in Ye et al., 2003, ?Trapezoidella sp., Candona sp., and Vlakomia ulanense Neustrueva, 1977. The biostratigraphic application of our taxonomic results suggests that the age of the Shinekhudag Formation is Barremian–Aptian. In addition, the ostracod fauna shows strong affinities to faunas from northeast China and potentially northwest China, providing evidence of faunal exchanges between these regions and southwest Mongolia. The new discovery of Vlakomia ulanense indicates that mid-Cretaceous (Albian) species in northeast China probably originated in Mongolia at the time of deposition of the Shinekhudag Formation. Two ostracod assemblages in the studied sections reflect that different paleoenvironment settings have existed during deposition; the Tsagaan Tsuvarga Section represents a shallow-littoral zone of athalassic (inland) saline lake under arid climate, and the dominance of cypridoideans of the Oshih Hollow East Section is indicative of ephemeral water bodies.

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Cretaceous beetles of the Jinju Formation (Coleoptera): An overview of the Jinju Formation, its coleopteran diversity, and past and future research

Lee,

Li,

Cai

et al. 2024

Journal of Asia-Pacific Entomology

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Taxonomy, biostratigraphic and paleoecological aspects of non-marine ostracod fauna from the Jinju Formation (Albian) of the Gyeongsang Basin, South Korea

Cited by 9 publications

References 50 publications

Turtle eggs from the Lower Cretaceous Hasandong Formation (South Korea) with relict aragonite under significant thermal maturity

Turtle eggs from the Lower Cretaceous Hasandong Formation (South Korea) with relict aragonite under significant thermal maturity

Nonmarine ostracod fauna from the Lower Cretaceous Shinekhudag Formation (southwest Mongolia): taxonomy, biostratigraphy, and paleoecology

Cretaceous beetles of the Jinju Formation (Coleoptera): An overview of the Jinju Formation, its coleopteran diversity, and past and future research

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