Cretaceous age for the feathered dinosaurs of Liaoning, China

IVPP-IR > 中科院古脊椎所（2000年以后）

	Cretaceous age for the feathered dinosaurs of Liaoning, China
	Swisher, CC; Wang, YQ(王元青); Wang, XL(汪筱林); Xu, Xing(徐星); Wang, Y(王元); Swisher, CC (reprint author), Berkeley Geochronol Ctr, 2455 Ridge Rd, Berkeley, CA 94709 USA.
	1999
发表期刊	NATURE
ISSN	0028-0836
卷号	400 期号:6739 页码:58—61
摘要	The ancient lake beds of the lower part of the Yixian Formation, Liaoning Province, northeastern China, have yielded a wide range of well-preserved fossils: the 'feathered' dinosaurs Sinosauropteryx(1), Protarchaeopteryx and Caudipteryx(2), the primitive birds Confuciusornis(3) and Liaoningornis(4), the mammal Zhangheotherium(5) and the reportedly oldest flowering plant, Archaefructus(6). Equally well preserved in the lake beds are a wide range of fossil plants, insects, bivalves, conchostracans, ostracods, gastropods, fish, salamanders, turtles, lizards, the frog Callobatrachus(7) and the pterosaur Eosipterus(1,8). This uniquely preserved assemblage of fossils is providing new insight into long-lived controversies over bird-dinosaur relationships(1,2), the early diversification of birds(3,9,10) and the origin and evolution of flowering plants(6). Despite the importance of this fossil assemblage, estimates of its geological age have varied widely from the Late Jurassic to the Early Cretaceous. Here we present the first Ar-40/Ar-39 dates unambiguously associated with the main fossil horizons of the lower part of the Yixian Formation, and thus, for the first time, provide accurate age calibration of this important fauna. The results of this dating study indicate that the lower Yixian fossil horizons are not Jurassic but rather are at least 20 Myr younger, placing them within middle Early Cretaceous time.
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文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/3953
专题	中科院古脊椎所（2000年以后）古低等脊椎动物研究室
通讯作者	Swisher, CC (reprint author), Berkeley Geochronol Ctr, 2455 Ridge Rd, Berkeley, CA 94709 USA.
推荐引用方式 GB/T 7714	Swisher, CC,Wang, YQ,Wang, XL,et al. Cretaceous age for the feathered dinosaurs of Liaoning, China[J]. NATURE,1999,400(6739):58—61.
APA	Swisher, CC,Wang, YQ,Wang, XL,Xu, Xing,Wang, Y,&Swisher, CC .(1999).Cretaceous age for the feathered dinosaurs of Liaoning, China.NATURE,400(6739),58—61.
MLA	Swisher, CC,et al."Cretaceous age for the feathered dinosaurs of Liaoning, China".NATURE 400.6739(1999):58—61.

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