干旱区生态环境知识资源中心(Arid): Paleosol-based inference of niches for Oligocene and early miocene fossils from the John Day Formation of Oregon

Arid

DOI	10.1080/02724634.2019.1761823
	Paleosol-based inference of niches for Oligocene and early miocene fossils from the John Day Formation of Oregon
	Retallack, Gregory J.; Samuels, Joshua X.
通讯作者	Retallack, GJ
来源期刊	JOURNAL OF VERTEBRATE PALEONTOLOGY
ISSN	0272-4634
EISSN	1937-2809
出版年	2020
卷号	40 期号:1
英文摘要	Over the past decade, we recorded exact locations of in situ fossils and measured calcareous nodules in paleosols of the Oligocene and lower Miocene (Whitneyan-Arikareean) John Day Formation of Oregon. These data enable precise biostratigraphy within an astronomical time scale of Milankovitch obliquity cycles and also provide mean annual precipitation and vegetation for each species. Fossils in paleosols of the John Day Formation alternated between semiarid shrubland and subhumid woodland communities every 41 ka. Land snails 'Polygyra'expansaandMonadenia dubiosawere found in semiarid paleosols, butVespericola dalliandMonadenia marginicolawere found in subhumid paleosols. Cicada burrows (Naktodemasis bowni) were found in semiarid paleosols, whereas dung beetle balls (Pallichnus dakotensis) and earthworm castings (Edaphichnium lumbricatum) were found in subhumid paleosols. Among hypertragulids,Hypertragulus hesperiuswas found in semiarid paleosols andNanotragulus planicepsin subhumid paleosols. Among glires, the aplodontiidHaplomys liolophus, geomyidsPleurolicus sulcifronsand several species ofEntoptychus, castoridPalaeocastor peninsulatus, and leporidArchaeolagus ennisianuswere found in semiarid paleosols. Large ungulates were found primarily in subhumid paleosols, including the agriochoereAgriochoerus antiquus, oreodontsEporeodon occidentalisandPromerycochoerus superbus, equidMiohippus annectens, and rhinosDiceratherium annectensandDiceratherium armatum. The inferred niches of fossil mammals are consistent with interpretations based on their morphology; taxa with adaptations for life in open, arid habitats, such as high-crowned teeth and semifossorial or cursorial limb structure, were mainly in semiarid paleosols, but taxa with arboreal adaptations were only found in subhumid paleosols.
类型	Article
语种	英语
收录类别	SCI-E ; SSCI
WOS记录号	WOS:000544604700001
WOS关键词	CONFIDENCE-INTERVALS ; WILLWOOD FORMATION ; TRACE FOSSILS ; NORTH-AMERICA ; BIGHORN BASIN ; NATIONAL-PARK ; MAMMALS ; GRASSLAND ; DIVERSITY ; PATTERNS
WOS类目	Paleontology
WOS研究方向	Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/324889
作者单位	[Retallack, Gregory J.] Univ Oregon, Dept Earth Sci, Eugene, OR 97403 USA; [Samuels, Joshua X.] East Tennessee State Univ, Dept Geosci, Johnson City, TN 37614 USA
推荐引用方式 GB/T 7714	Retallack, Gregory J.,Samuels, Joshua X.. Paleosol-based inference of niches for Oligocene and early miocene fossils from the John Day Formation of Oregon[J],2020,40(1).
APA	Retallack, Gregory J.,&Samuels, Joshua X..(2020).Paleosol-based inference of niches for Oligocene and early miocene fossils from the John Day Formation of Oregon.JOURNAL OF VERTEBRATE PALEONTOLOGY,40(1).
MLA	Retallack, Gregory J.,et al."Paleosol-based inference of niches for Oligocene and early miocene fossils from the John Day Formation of Oregon".JOURNAL OF VERTEBRATE PALEONTOLOGY 40.1(2020).