High-precision 40Ar/39Ar age for the Jehol Biota

Chang, Shaohua; Zhang, Hua; Renne, Paul R.; Fang, Yan

doi:10.1016/j.palaeo.2009.06.021

Cited by 208 publications

(104 citation statements)

References 65 publications

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“…This conclusion is also supported by radiometric datings from both the bed and the overlying Tiaojishan Formation, which gave an age range of 165-158 Ma, belonging mainly to the Callovian of the Middle Jurassic to the Oxfordian of the Late Jurassic (e.g. Chen et al 2004, He et al 2004, Liu et al 2006b, Chang et al 2009, Huang 2015, Xu et al 2016, Zhou & Wang 2017.…”

Section: The Age Of the Daohugou Bedmentioning

confidence: 72%

“…Consequently, they can be confidently assigned to the Callovian-Oxfordian (165-158 Ma) Haifanggou Formation underlying the slightly younger Kimmeridgian (≥157 Ma) Tiaojishan Formation (e.g. Chen et al 2004, He et al 2004, Liu et al 2006b, Chang et al 2009, Jiang et al 2010, Huang 2015, Xu et al 2016, Zhou & Wang 2017, both of which, however, are known to have produced the Yanliao Biota. The assemblage of plant fossils presented here may thus serve for the identification of other fossils from that area.…”

Section: Discussionmentioning

confidence: 99%

“…Chen et al 2004, He et al 2004, Liu et al 2006b, Chang et al 2009) have indicated that the age of the tuff is between late Middle Jurassic and early Late Jurassic, or 165-158 Ma (e.g. Chen et al 2004: 165-164 Ma;He et al 2004: 159.8 Ma; Liu Liu et al 2012: 161-159 Ma;Huang 2015: 168-163.5 Ma;Xu et al 2016: 168-159 Ma;Zhou & Wang 2017: 160 Ma).…”

Section: Geological Settingmentioning

confidence: 99%

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Plant remains from the Middle–Late Jurassic Daohugou site of the Yanliao Biota in Inner Mongolia, China

Pott¹,

Jiang²

2017

Acta Palaeobotanica

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ABSTRACT. A late Middle-early Late Jurassic fossil plant assemblage recently excavated from two CallovianOxfordian sites in the vicinity of the Daohugou fossil locality in eastern Inner Mongolia, China, was analysed in detail. The Daohugou fossil assemblage is part of the Callovian-Kimmeridgian Yanliao Biota of north-eastern China. Most major plant groups thriving at that time could be recognized. These include ferns, caytonialeans, bennettites, ginkgophytes, czekanowskialeans and conifers. All fossils were identified and compared with species from adjacent coeval floras. Considering additional material from three collections housed at major palaeontological institutions in Beijing, Nanjing and Pingyi, and a recent account in a comprehensive book on the Daohugou Biota, the diversity of the assemblage is completed by algae, mosses, lycophytes, sphenophytes and putative cycads. The assemblage is dominated by tall-growing gymnosperms such as ginkgophytes, czekanowskialeans and bennettites, while seed ferns, ferns and other water-or moisture-bound groups such as algae, mosses, sphenophytes and lycophytes are represented by only very few fragmentary remains. The floral composition underlines the Callovian-Kimmeridgian age of the Yanliao Biota. The Daohugou/Yanliao flora is a typical member of the Middle to Late Jurassic Coniopteris-Phoenicopsis assemblage of north-eastern China, differing from the Early Cretaceous Jehol flora. Both floras probably belong to the same cycle of volcanism and sedimentation, although the Daohugou Bed is older than the Yixian Formation. The Yanliao fossil assemblage is placed in a larger palaeo-phytogeographical context and its relationships with Middle-Late Jurassic floras from north-eastern China, north-eastern and eastern Siberia and Japan are evaluated.

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Section: The Age Of the Daohugou Bedmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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Plant remains from the Middle–Late Jurassic Daohugou site of the Yanliao Biota in Inner Mongolia, China

Pott¹,

Jiang²

2017

Acta Palaeobotanica

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“…Strata near Yizhou, which have also yielded the holotype of H. baitaigouensis, are from the upper part of the Yixian Formation . Radiometric dates indicate that the Yixian Formation has a chronological range of 122.3 -129.7 Ma (Smith et al 1995;Chang et al 2009). …”

Section: Methodsmentioning

confidence: 99%

Implications of flexible-shelled eggs in a Cretaceous choristoderan reptile

Hou

Ksepka

et al. 2009

Proc. R. Soc. B.

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Flexible, or soft-shelled, eggs are almost unknown in the fossil record, leaving large gaps in our knowledge of the reproductive biology of many tetrapod clades. Here, we report two flexible-shelled eggs of the hyphalosaurid choristodere Hyphalosaurus baitaigouensis from the Early Cretaceous of China, one containing an embryo and the second associated with a neonate. Choristoderes are an enigmatic group of aquatic reptiles that survived the K-T extinction but died out in the Miocene. Hyphalosaurids, a specialized clade of Choristodera, resemble miniature plesiosaurs and are considered to be primarily aquatic in habit. Scanning electron microscopy of samples from the eggs reveals a thin, non-columnar external mineralized layer characterized by rounded nodes and tentatively identified poorly structured irregular pores, with an underlying amorphous layer presumably representing decomposed protein fibrils. While the relationships of Choristodera remain controversial, eggshell microstructure more closely resembles that of Lepidosauromorpha (the lineage including lizards) as opposed to that of Archosauromorpha (the lineage including birds and crocodiles).

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“…In the marine record, cold climatic intervals have been recognized during the Early Cretaceous period, with two major events occurring (i) during the early Valanginian, and (ii) from the late Barremian to the early Albian (4, 5). The most recent 40 Ar∕ 39 Ar dating of sanidine crystals from tuff beds within the Yixian Formation and the base of the overlying Jiufotang Formation gave an age bracket of 129.7 AE 0.5 Ma to 122.1 AE 0.3 Ma for the deposition of the Yixian Formation (6). These ages correspond to a Barremian to early Aptian age interval which is encompassed by the second cold interval.…”

mentioning

confidence: 94%

Oxygen isotopes of East Asian dinosaurs reveal exceptionally cold Early Cretaceous climates

Amiot

Wang

Zhou

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

139

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Early Cretaceous vertebrate assemblages from East Asia and particularly the Jehol Biota of northeastern China flourished during a period of highly debated climatic history. While the unique characters of these continental faunas have been the subject of various speculations about their biogeographic history, little attention has been paid to their possible climatic causes. Here we address this question using the oxygen isotope composition of apatite phosphate (δ ) from various reptile remains recovered from China, Thailand, and Japan. δ values indicate that cold terrestrial climates prevailed at least in this part of Asia during the Barremian—early Albian interval. Estimated mean air temperatures of about 10 ± 4 °C at midlatitudes (∼42 °N) correspond to present day cool temperate climatic conditions. Such low temperatures are in agreement with previous reports of cold marine temperatures during this part of the Early Cretaceous, as well as with the widespread occurrence of the temperate fossil wood genus Xenoxylon and the absence of thermophilic reptiles such as crocodilians in northeastern China. The unique character of the Jehol Biota is thus not only the result of its evolutionary and biogeographical history but is also due to rather cold local climatic conditions linked to the paleolatitudinal position of northeastern China and global icehouse climates that prevailed during this part of the Early Cretaceous.

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High-precision 40Ar/39Ar age for the Jehol Biota

Cited by 208 publications

References 65 publications

Plant remains from the Middle–Late Jurassic Daohugou site of the Yanliao Biota in Inner Mongolia, China

Plant remains from the Middle–Late Jurassic Daohugou site of the Yanliao Biota in Inner Mongolia, China

Implications of flexible-shelled eggs in a Cretaceous choristoderan reptile

Oxygen isotopes of East Asian dinosaurs reveal exceptionally cold Early Cretaceous climates

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