Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.14241/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
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ISSN | 0208-9068 |
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 |
推荐引用方式 GB/T 7714 | 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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