DOI: 10.1016/j.palaeo.2015.03.008
论文题名: Flattened fossil footprints: Implications for paleobiology
作者: Lockley M.G. ; Xing L.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 426 起始页码: 85
结束页码: 94
语种: 英语
英文关键词: Footprints
; Overburden pressures
; Theropods
; Track preservation
英文摘要: Studies of natural casts of dinosaur footprints associated with very thin mudstone and siltstone intervals in thick sand-dominated sequences often reveal casts that are significantly flattened due to the differential effects of overburden pressures on different lithologies. They are in effect squeezed, vise-like, between two thick, non-compactable sand layers. Thus, the sand filled tracks (casts) are flattened or widened as the ductile layers are compressed. Such flattening, here described from five localities, is a previously unreported phenomenon with implications for vertebrate ichnology. Present evidence suggest that significant flattening is not evident in most sequences in which mudstone and siltstone intervals are thicker, even though overburden pressures may have been comparable. Examples from the Jurassic of North America and the Cretaceous of China show that the flattening (widening) of tridactyl theropod tracks leads to predictable changes in track cast morphology, which may influence interpretations of track maker identity, and ichnotaxonomy. In the theropod dominated samples described here, such extramorphological changes differentially affect the shape of the whole cast and individual digit trace casts making them appear more "fleshy" and sometimes deceptively convergent with ornithopod tracks. © 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68973
Appears in Collections: 过去全球变化的重建
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作者单位: Dinosaur Tracks Museum, University of Colorado Denver, P.O. Box 173364, Denver, CO, United States; School of the Earth Sciences and Resources, China University of Geosciences, Beijing, China
Recommended Citation:
Lockley M.G.,Xing L.. Flattened fossil footprints: Implications for paleobiology[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,426