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标题：Turtle tracks from the Late Jurassic of Asturias, Spain
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作者：MARCO AVANZINI ; JOSÉ CARLOS GARCÍA-RAMOS ; JOSÉ CARLOS GARCÍA-RAMOS 等
期刊名称：Acta Palaeontologica Polonica
印刷版ISSN：0567-7920
电子版ISSN：1732-2421
出版年度：2005
卷号：50
期号：4
页码：743-755
语种：English
出版社：Institute of Paleobiology PAS
摘要：Although tracks of dinosaurs are well known from Upper Jurassic sediments, tracks of non-dinosaurian vertebrates are fairly rare. The Upper Jurassic Lastres Formations of Asturias in northern Spain contain many vertebrate tracksites that include footprints and trackways of non-dinosaurian tetrapods. Several of these tracks are natural casts of pentadactyl to tridactyl footprints with digits connected by arched structures. The digits are short with deep scratch marks oriented anteriorly. The Asturian tracks show a high degree of morphological similarity to other specimens previously described as possible turtle tracks. Observations from extant turtle trackways show some surprising similarities with the fossil material. The tracks are here interpreted as having been made by turtles partially buoyed by water or by turtles walking in a slightly wet subaerial environment.
关键词：Testudines;turtle tracks;gait pattern;experimental ichnology;Jurassic;Asturias