Confirmation of a Middle Jurassic age for the Eedemt Formation in Dundgobi Province, southeast Mongolia: constraints from the discovery of new spinicaudatans (clam shrimps)

Confirmation of a Middle Jurassic age for the Eedemt Formation in Dundgobi Province, southeast Mongolia: constraints from the discovery of new spinicaudatans (clam shrimps)
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蒙古东南部敦戈壁省Eedemt组中侏罗世年龄的确认:新棘虾(蛤虾)发现的限制

DOI:
10.1080/03115518.2014.870834
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发表时间:
2014-07
期刊:
影响因子:
1.3
通讯作者:
Ichinnorov, Niiden
Ichinnorov, Niiden
中科院分区:
地球科学4区
文献类型:
--
作者:
Hasegawa, Takashi;Ohta, Tohru;Hasebe, Noriko;Ichinnorov, Niiden

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本文报道了两种刺尾类动物,即三角纹虫Triglypta edemtensis Li,sp. nov.和曼达尔戈壁盾尾虫Dundgobiestheria mandalgobiensis Li gen. et sp. nov.,根据对新采集的样品进行扫描电子显微镜(SEM)成像进行了描述,这些样品来自暴露在蒙古东南部敦戈比省Khootiin Khotgor煤矿区Eedemt地点的Eedemt组纸薄层压黑色页岩。三角网蝽主要由点和一个点状细网构成,放射状纹仅出现在腹侧的两个或三个生长带上。小刺尾虫Triglypta是中侏罗世Euestheria ziliujingensis动物群和Sinokontikia动物群的共同组成部分,是北方冀北、新疆准噶尔盆地和吐鲁番盆地中侏罗世湖相层序的典型分类单元,但在其他地区的较高地层单元中并不存在。因此,Eedemt组的时代应被认为是中侏罗世而不是早白垩世。Eedemt组比蒙古东南部Shine Khudag地区的早白垩世Shinekhudag组古老得多。
Two spinicaudatan species, Triglypta eedemtensis Li sp. nov. and Dundgobiestheria mandalgobiensis Li gen. et sp. nov., are described on the basis of scanning electron microscopy (SEM) imaging of newly collected specimens from paper-thin laminated black shale of the Eedemt Formation exposed at the Eedemt locality in the Khootiin Khotgor coal mine region of Dundgobi Province in southeast Mongolia. Triglypta eedemtensis is ornamented mainly with puncta and a punctate fine reticulum; radial lirae occur only on two or three growth bands near the venter. The small spinicaudatan Triglypta is a common component of the Middle Jurassic Euestheria ziliujingensis fauna and Sinokontikia fauna, and is a typical taxon in the Middle Jurassic lacustrine sequences of northern Hebei and the Junggar and Turpan basins of the Xinjiang Autonomous District of China; however, it does not occur in stratigraphically higher units elsewhere. Therefore, the age of the Eedemt Formation should be considered Middle Jurassic rather than Early Cretaceous. The Eedemt Formation is much older than the Early Cretaceous Shinekhudag Formation in the Shine Khudag area of southeast Mongolia.
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