U-Pb zircon age for the Daohugou Biota at Ningcheng of Inner Mongolia and comments on related issues

Liu, Yongqing; Liu, Yanxue; Shu'an, JI; Yang, Zhiqing

doi:10.1007/s11434-006-2165-2

Cited by 126 publications

(70 citation statements)

References 19 publications

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“…1). With a radiometric date of 157 ± 3 Ma from the overlaying rocks (12), the fossil beds of the Upper Jurassic Tiaojishan (Lanqi) Formation consist of volcanic ash deposited in a lake during Oxfordian time (19). Thus, this Late Jurassic fossil taxon documents the earliest known record of the Salamandroidea, predating a previously Early Cretaceous record (Valdotriton, 116-114 Ma) by some 40 Ma (14).…”

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confidence: 88%

Late Jurassic salamandroid from western Liaoning, China

Gao

Shubin

2012

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

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A Jurassic salamander, Beiyanerpeton jianpingensis (gen. et sp. nov.), from a recently found site in western Liaoning Province, China is the earliest known record of Salamandroidea. As a Late Jurassic record of the group, it extends the range of the clade by ~40 Ma. The Late Jurassic taxon is neotenic and represented by exceptionally preserved specimens, including fully articulated cranial and postcranial skeletons and bony gill structures close to the cheek region. The fossil beds, consisting of dark-brown volcanic ash shales of the Upper Jurassic Tiaojishan (Lanqi) Formation (Oxfordian), underlie trachyandesite rocks that have yielded a SHRIMP zircon U-Pb date of 157 ± 3 Ma. The fossiliferous beds are substantially older than the Jehol Group, including the Yixian Formation ( 40 Ar/ 39 Ar dates of 122–129 Ma), but slightly younger than the Middle Jurassic Daohugou horizon ( 40 Ar/ 39 Ar date of 164 ± 4 Ma). The early fossil taxon shares with extant salamandroids derived character states, including: separated nasals lacking a midline contact, angular fused to the prearticular in the lower jaw, and double-headed ribs on the presacral vertebrae. In contrast to extant salamandroids, however, the salamander shows a discrete and tooth-bearing palatine, and unequivocally nonpedicellate and monocuspid marginal teeth in large and presumably mature individuals. The finding provides insights into the evolution of key characters of salamanders, and also provides direct evidence supporting the hypothesis that the split between Cryptobranchoidea and Salamandroidea had taken placed before the Late Jurassic Oxfordian time. In this aspect, both paleontological and molecular data now come to agree.

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confidence: 88%

Late Jurassic salamandroid from western Liaoning, China

Gao

Shubin

2012

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

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“…The precise age and stratigraphic position of the Daohugou Bed have been debated extensively (e.g. He et al 2004, Wang et al 2005, Gao & Ren 2006, but the vast majority of results published thus far indicate an early Late Jurassic (Callovian-Kimmeridgian) age for the Yanliao Biota , Shen et al 2003, Chen et al 2004, 2006a, b, Gao & Ren 2006, Huang et al 2006, Yang & Li 2008, Jiang et al 2010, Cohen et al 2013.…”

Section: Geological Settingmentioning

confidence: 99%

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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“…The new, well preserved specimen was collected from the Jiulongshan Formation (Daohugou, Inner Mongolia, China), famous for its rich fossil insect fauna, including Hymenoptera Wang et al 2014), Coleoptera (Pan et al 2011;Liu et al 2015), Diptera (Chen et al 2014;Shi et al 2015), Odonata (Zhang et al 2008;Nel & Huang 2015) and others (Ren et al 2009;Chen et al 2015Chen et al , 2016 Ar, Ar-Ar and SHRIMP U-Pb (He et al 2004;Liu et al 2006;Li et al 2013). …”

Section: R E S E a R C H A R T I C L Ementioning

confidence: 99%

A new mesoserphid wasp from the Middle Jurassic of northeastern China (Hymenoptera, Proctotrupoidea)

Zheng

2017

EJT

632

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Abstract.A new genus and species of Mesoserphidae (Hymenoptera), Juraserphus modicus gen. et sp. nov., is described based on a well-preserved fossil specimen from the Middle Jurassic Jiulongshan Formation of northeastern China. It is characterized by the following forewing features: the forking of Rs+M located approximately one-third of the distance between 1m-cu and 2r-rs, both 1cu-a and 2cu-a antefurcal; 1-M more than twice as long as 1m-cu and hind wing with cells r and rm closed. In addition, it has a short ovipositor, only extending slightly beyond the metasomal apex. Its new morphological characters broaden the diversity of Mesoserphidae in the Mesozoic and provide new insights into the evolution and relationships of Mesoserphidae.

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U-Pb zircon age for the Daohugou Biota at Ningcheng of Inner Mongolia and comments on related issues

Cited by 126 publications

References 19 publications

Late Jurassic salamandroid from western Liaoning, China

Late Jurassic salamandroid from western Liaoning, China

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

A new mesoserphid wasp from the Middle Jurassic of northeastern China (Hymenoptera, Proctotrupoidea)

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