[dinosaur] Fastest running dinosaur

[Poekilopleuron <dinosaurtom2015@seznam.cz>]

Good day!

In recently published paper (Lockley et al., 2021) there is a statement that the fastest calculated speed from trackways was as high as 49 km/h (13.6 m/s). It was also suggested that this is the fastest documented trackway in a Jurassic theropod. Does that mean we know of a trackway that records even faster run in non-avian dinosaur? As far as I know, the "record" so far was 42.8 km/h (11.9 m/s) obtained for a trackway in Texas (Farlow, 1981). Thanks to anyone who can say more on this! Tom

Update: In abstract published on GSA web I found (after I wrote the text above) this statement of authors: "At least four trackways, mostly the deeper ones, provide evidence of running individuals, two of which attained estimated speeds in excess of the current âworld recordâ estimate (42.8 km/hr) claimed for a Cretaceous theropod from Texas." That probably explained the whole thing.

Still, there is another theropod trackway from Spain with a calculated speed of running at about 37 km/h (10.3 m/s) and also a two step trackway of an unknown dromaeosaurid running presumably up to 50 km/h (13.9 m/s) in Poland (Gierlinski, 2009). Does anyone know more about this? Could this be regarded as a dinosaurian "world speed record"? Thank you in advance!

References:

Martin Lockley, Brent Breithaupt, Neffra A. Matthews, Kenichiro Shibata & ReBecca Hunt-Foster (2021). A preliminary report report on an Early Jurassic Eubrontes-dominated tracksite in the Navajo Sandstone Formation at the Mail Station dinosaur tracksite, San Juan County, Utah. In: Lucas, S. G., Hunt, A. P. & Lichtig, A. J., 2021, Fossil Record 7. New Mexico Museum of Natural History and Science Bulletin. 82: 195-208.

Farlow, J. O. (1981). Estimates of dinosaur speeds from a new trackway site in Texas. Nature. 294: 747-748.

Gierlinski, G. D. (2009). A preliminary report on new dinosaur tracks in the Triassic, Jurassic and Cretaceous of Poland. In: Actas de las IV Jornadas Internacionales sobre PaleontologÃa de Dinosaurios y su Entorno Salas de los Infantes, Burgos.