Arid
DOI10.14241/asgp.2018.010
DINOSAUR BEHAVIOUR IN AN EARLY JURASSIC PALAEOECOSYSTEM - UPPERMOST ELLIOT FORMATION, HA NOHANA, LESOTHO
Rampersadh, Akhil; Bordy, Emese M.; Sciscio, Lara; Abrahams, Miengah
通讯作者Rampersadh, Akhil
来源期刊ANNALES SOCIETATIS GEOLOGORUM POLONIAE
ISSN0208-9068
出版年2018
卷号88期号:2页码:163-179
英文摘要

The Ha Nohana palaeosurface in southern Lesotho preserves tridactyl and tetradactyl tracks and trackways attributable to Early Jurassic bipedal, theropod-like dinosaurs. Complementary sedimentological and ichnological observations along the palaeosurface and in the strata below and above it allow detailed interpretations of climatically driven changes in this southern Gondwana palaeoecosystem. Sedimentological evidence suggests trackmaking under a semi-arid climate with heavy storms and episodic flash flooding that induced ephemeral, unconfined sheetwashes. The palaeosurface is overlain by rhythmically bedded, organic-matter rich mudstones that formed in a deep, stratified lake indicative of a longer and wetter period in the history of the site. The unique morphological details of the Ha Nohana tracks help refine the properties of the substrate during track making, the ichnotaxonomic affinities of the footprints and the interpretation of the foot movement relative to the substrate. Two footprint morphotypes, similar to 300 m apart, are defined on the palaeosurface. Tracks of morphotype I are tridactyl, shallow, contain digital pad impressions and were impressed on a firm, sand rippled substrate that underwent desiccation. Conversely, tracks of morphotype II are tetradactyl, deep, and have an elongated posterior region. These tracks are preserved on the surface of a massive sandstone and are associated with soft sediment collapse structures related to the animal’s foot sinking into the water-saturated, malleable sediment layer. Morphotype II tracks show that as the animal waded across the substrate, the liquefied sediment lost its cohesive strength and could only partially support the weight of the animal. In so doing, the animal’s foot sunk deep enough into the sediment such that the impression of the metatarsal and digit I (hallux) are now visible. Thus, the palaeosurface was walked on by small-to-medium sized theropods that traversed over ripple marks in firmer moist sand, as well as a larger theropod that tottered through water-logged sand.


英文关键词Vertebrate ichnology tridactyl tetradactyl climate change southern Gondwana Karoo upper Elliot Formation
类型Article ; Proceedings Paper
语种英语
国家South Africa
收录类别SCI-E ; CPCI-S
WOS记录号WOS:000454214100003
WOS关键词MAIN KAROO BASIN ; SOUTHERN AFRICA ; VERTEBRATE TRACKS ; THEROPOD ; SEDIMENTOLOGY ; STRATIGRAPHY ; PRESERVATION ; SUPERGROUP ; EVOLUTION ; FOOTPRINTS
WOS类目Geology
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/207551
作者单位Univ Cape Town, Dept Geol Sci, ZA-7701 Rondebosch, South Africa
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Rampersadh, Akhil,Bordy, Emese M.,Sciscio, Lara,et al. DINOSAUR BEHAVIOUR IN AN EARLY JURASSIC PALAEOECOSYSTEM - UPPERMOST ELLIOT FORMATION, HA NOHANA, LESOTHO[J],2018,88(2):163-179.
APA Rampersadh, Akhil,Bordy, Emese M.,Sciscio, Lara,&Abrahams, Miengah.(2018).DINOSAUR BEHAVIOUR IN AN EARLY JURASSIC PALAEOECOSYSTEM - UPPERMOST ELLIOT FORMATION, HA NOHANA, LESOTHO.ANNALES SOCIETATIS GEOLOGORUM POLONIAE,88(2),163-179.
MLA Rampersadh, Akhil,et al."DINOSAUR BEHAVIOUR IN AN EARLY JURASSIC PALAEOECOSYSTEM - UPPERMOST ELLIOT FORMATION, HA NOHANA, LESOTHO".ANNALES SOCIETATIS GEOLOGORUM POLONIAE 88.2(2018):163-179.
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