干旱区生态环境知识资源中心(Arid): Early adaptation to eolian sand dunes by basal amniotes is documented in two Pennsylvanian Grand Canyon trackways

Arid

DOI	10.1371/journal.pone.0237636
	Early adaptation to eolian sand dunes by basal amniotes is documented in two Pennsylvanian Grand Canyon trackways
	Rowland, Stephen M.; Caputo, Mario, V; Jensen, Zachary A.
通讯作者	Rowland, SM
来源期刊	PLOS ONE
ISSN	1932-6203
出版年	2020
卷号	15 期号:8
英文摘要	We report the discovery of two very early, basal-amniote fossil trackways on the same bedding plane in eolian sandstone of the Pennsylvanian Manakacha Formation in Grand Canyon, Arizona. Trackway 1, which isChelichnus-like, we interpret to be a shallow undertrackway. It displays a distinctive, sideways-drifting, footprint pattern not previously documented in a tetrapod trackway. We interpret this pattern to record the trackmaker employing a lateral-sequence gait while diagonally ascending a slope of about 20 degrees, thereby reducing the steepness of the ascent. Trackway 2 consists only of aligned sets of claw marks. We interpret this trackway to be a deeper undertrackway, made some hours or days later, possibly by an animal that was conspecific with Trackmaker 1, while walking directly up the slope at a speed of approximately 0.1 m/sec. These trackways are the first tetrapod tracks reported from the Manakacha Formation and the oldest in the Grand Canyon region. The narrow width of both trackways indicates that both trackmakers had relatively small femoral abduction angles and correspondingly relatively erect postures. They represent the earliest known occurrence of dunefield-dwelling amniotes?either basal reptiles or basal synapsids?thereby extending the known utilization of the desert biome by amniotes, as well as the presence of theChelichnusichnofacies, by at least eight million years, into the Atokan/Moscovian Age of the Pennsylvanian Epoch. The depositional setting was a coastal-plain, eolian dunefield in which tidal or wadi flooding episodically interrupted eolian processes and buried the dunes in mud.
类型	Article
语种	英语
开放获取类型	DOAJ Gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000563929200021
WOS关键词	ALLIGATOR-MISSISSIPPIENSIS ; FOOTPRINTS ; ORIGIN ; LOCOMOTION ; SANDSTONE ; STRATIFICATION ; PRESERVATION ; ICHNOFACIES ; COCONINO ; DEPOSITS
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325891
作者单位	[Rowland, Stephen M.] Univ Nevada, Dept Geosci, Las Vegas, NV 89154 USA; [Rowland, Stephen M.] Las Vegas Nat Hist Museum, Las Vegas, NV 89101 USA; [Caputo, Mario, V] Pacific Sect SEPM Soc Sedimentary Geol, Tujunga, CA USA; [Jensen, Zachary A.] Coll Southern Nevada, Dept Phys Sci, Las Vegas, NV USA
推荐引用方式 GB/T 7714	Rowland, Stephen M.,Caputo, Mario, V,Jensen, Zachary A.. Early adaptation to eolian sand dunes by basal amniotes is documented in two Pennsylvanian Grand Canyon trackways[J],2020,15(8).
APA	Rowland, Stephen M.,Caputo, Mario, V,&Jensen, Zachary A..(2020).Early adaptation to eolian sand dunes by basal amniotes is documented in two Pennsylvanian Grand Canyon trackways.PLOS ONE,15(8).
MLA	Rowland, Stephen M.,et al."Early adaptation to eolian sand dunes by basal amniotes is documented in two Pennsylvanian Grand Canyon trackways".PLOS ONE 15.8(2020).