![]() Nevertheless, this kind of track has not been formally defined. Thulborn proposed that large ornithopod tracks are those larger than 25 cm and related them with iguanodonts and hadrosaurs. The term “large ornithopod tracks” (or “large ornithopod footprints”) has been used in many ichnological papers (e.g., ). Amblydactylus, Iguanodontipus, Caririchnium). They include the tracks historically called Iguanodon footprints, iguanodont/iguanodontid footprints, hadrosaur/hadrosaurid footprints, as well as others that have been used to define ichnotaxa (e.g. Subsequently, large ornithopod tracks have been found in Asia (e.g., ), North America (e.g., ), South America (e.g., ), Australia and Africa. Large ornithopod tracks have been studied since the beginnings of vertebrate ichnology in 19th-century Europe (e.g., ). Its distribution is confidently limited to the Cretaceous of Europe, Asia, North America and South America. The ichnofamily Iguanodontipodidae includes large iguanodontian tracks characterized mainly by mesaxonic, tridactyl and subsymmetrical pes tracks that are as wide as (or wider than) long and have one pad impression in each digit and one in the heel. It is known from the Aptian-Albian to the Maastrichtian of North America, Asia and Europe. kyoungsookimi) shows a large, bilobed heel and short, wide digit impressions. Finally, Hadrosauropodus (three ichnospecies: H. This ichnogenus ranges from the Berriasian-Hauterivian to the Aptian-Albian of South America, North America, Asia and Europe. ![]() lotus) with a large, rounded heel and short, wide digit impressions. Caririchnium consists of four ichnospecies ( C. Its distribution is limited to the Berriasian-Valanginian of Europe. burreyi) is characterized by a small, rounded heel and elongate, narrow digit impressions. The monospecific ichnogenus Iguanodontipus ( I.
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