Hettangian (Early Jurassic) dinosaur tracksites from the Mecsek Mountains, Hungary

Attila Osi, József Pálfy, László Makádi, Zoltán Szentesi, Péter Gulyás, Márton Rabi, Gábor Botfalvai, Kinga Hips

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5 Citations (Scopus)

Abstract

Isolated theropod dinosaur tracks were first collected in Hungary from Hettangian (Lower Jurassic) beds of the Mecsek Coal Formation in 1966 and described as Komlosaurus carbonis Kordos, 1983. Our study is based on newly collected material from additional track-bearing beds. The description of the two largest preserved surfaces containing a total of 102 tracks that can be referred to as 21 trackways is provided here. This represents the first attempt to measure, map and compare the tracks of these bipedal, functionally tridactyl dinosaurs in several associated trackways. Significant morphological variability can be observed (e.g., depth, presence or absence of a metatarsal impression, digit length, digit divarication angle) that is explained by differences in physical parameters of the substrate. The mean of pes length is 16.3 cm in tracksite PB1 and 19.9 cm in tracksite PB2. Stride length of trackways usually ranges between 120 and 170 cm; pace angulation is 160-175°. The speed of the trackmaker is calculated to range between 6 and 14 km/h. Imprints are diagnosed by a pes length/width ratio lower than 2.0; metatarsal pads and hallux impressions are frequent. Based on the similarity of several morphological characters, the herein described tracks are referred to the ichnotaxon Komlosaurus carbonis, which is clearly distinct from Grallator and Kayentapus.

Original languageEnglish
Pages (from-to)79-94
Number of pages16
JournalIchnos:an International Journal of Plant and Animal
Volume18
Issue number2
DOIs
Publication statusPublished - Apr 1 2011

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Keywords

  • Hettangian
  • Hungary
  • Komlosaurus
  • Morphological variability
  • Trackways

ASJC Scopus subject areas

  • Palaeontology

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