干旱区生态环境知识资源中心(Arid): THE INFLUENCE OF DEPOSITIONAL ENVIRONMENT AND BASIN HISTORY ON THE TAPHONOMY OF MAMMALIAN ASSEMBLAGES FROM THE BARSTOW FORMATION (MIDDLE MIOCENE), CALIFORNIA

Arid

DOI	10.2110/palo.2019.067
	THE INFLUENCE OF DEPOSITIONAL ENVIRONMENT AND BASIN HISTORY ON THE TAPHONOMY OF MAMMALIAN ASSEMBLAGES FROM THE BARSTOW FORMATION (MIDDLE MIOCENE), CALIFORNIA
	Loughney, Katharine M.1,2; Badgley, Catherine 1,2
通讯作者	Loughney, Katharine M.
来源期刊	PALAIOS
ISSN	0883-1351
EISSN	1938-5323
出版年	2020
卷号	35 期号:4 页码:175-190
英文摘要	The Barstow Formation in the Mojave region of California was deposited in an extensional-basin setting of the Basin and Range province and preserves diverse middle Miocene mammalian assemblages. Six facies associations represent the dominant depositional environments in the basin, which changed through time from alluvial-fan and playa-dominated settings to floodplains and spring-fed wetlands. The majority of fossil localities and specimens occur in later-forming facies associations. We analyzed the taphonomic characteristics of fossil assemblages to test whether basin-scale facies associations or locality-scale facies exert more control on the preservational features of mammalian assemblages through the formation. We documented the fades settings of 47 vertebrate localities in the field in order to interpret depositional setting and the mode of accumulation for fossil assemblages. We evaluated skeletal material in museum collections for taphonomic indicators, including weathering stage, original bone-damage patterns, hydraulic equivalence, and skeletal-element composition. We evaluated four alternative modes of accumulation, including attritional accumulation on the land surface, accumulation by fluvial processes, carnivore or scavenger accumulations, and mass-death events. The majority of localities represent attritional accumulations at sites of long-term mortality in channel-margin, abandoned-channel, poorly drained floodplain, and ephemeral-wetland settings. Skeletal-element composition and taphonomic characteristics varied among facies, indicating an important role for depositional setting and landscape position on fossil-assemblage preservation. We find that locality-scale facies have a greater influence on the taphonomic characteristics of fossil assemblages; the taphonomy of each facies association is influenced by the facies that compose it. The facies composition and distribution within facies associations change through the formation, with a greater variety of depositional settings forming later in the history of the basin. Heterogeneous landscapes present more settings for fossil accumulation, contributing to the increase in fossil occurrence through the depositional history of the formation.
类型	Article
语种	英语
国家	USA
收录类别	SCI-E ; SSCI
WOS记录号	WOS:000531821400002
WOS关键词	FOREST NATIONAL-PARK ; MOJAVE DESERT ; FOSSIL PRESERVATION ; BONE ACCUMULATIONS ; VERTEBRATE ; BIOSTRATIGRAPHY ; RESOLUTION ; RECORDS ; RIVER
WOS类目	Geology ; Paleontology
WOS研究方向	Geology ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/318547
作者单位	1.Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA; 2.Univ Michigan, Dept Ecol & Evolutionary Biol, Ann Arbor, MI 48019 USA
推荐引用方式 GB/T 7714	Loughney, Katharine M.,Badgley, Catherine. THE INFLUENCE OF DEPOSITIONAL ENVIRONMENT AND BASIN HISTORY ON THE TAPHONOMY OF MAMMALIAN ASSEMBLAGES FROM THE BARSTOW FORMATION (MIDDLE MIOCENE), CALIFORNIA[J],2020,35(4):175-190.
APA	Loughney, Katharine M.,&Badgley, Catherine.(2020).THE INFLUENCE OF DEPOSITIONAL ENVIRONMENT AND BASIN HISTORY ON THE TAPHONOMY OF MAMMALIAN ASSEMBLAGES FROM THE BARSTOW FORMATION (MIDDLE MIOCENE), CALIFORNIA.PALAIOS,35(4),175-190.
MLA	Loughney, Katharine M.,et al."THE INFLUENCE OF DEPOSITIONAL ENVIRONMENT AND BASIN HISTORY ON THE TAPHONOMY OF MAMMALIAN ASSEMBLAGES FROM THE BARSTOW FORMATION (MIDDLE MIOCENE), CALIFORNIA".PALAIOS 35.4(2020):175-190.