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The footprints, dating back to the Early Cretaceous period, were found in Brazil and in Cameroon, researchers wrote in a study published Monday by the New Mexico Museum of Natural History & Science.
Grallator (GRA-lÉ™-tor) is an ichnogenus (form taxon based on footprints) which covers a common type of small, three-toed print made by a variety of bipedal theropod dinosaurs. Grallator -type footprints have been found in formations dating from the Early Triassic through to the early Cretaceous periods.
The footprints were first discovered in the 1960s by station manager, Glen Seymour, in the nearby Seymour Quarry. Palaeontologists from the Queensland Museum, including Mary Wade and Tony Thulborn and the University of Queensland excavated Lark Quarry during 1976–77 (the quarry was named after Malcolm Lark, a volunteer who removed a lot of the overlying rock.)
A team of researches, led by Southern Methodist University (SMU) paleontologist Louis L. Jacobsfound over 260 matching sets of Early Cretaceous dinosaur footprints in Brazil and Cameroon ...
Footprints left by three-toed theropods. The study found that the majority of the fossil footprints were formed by theropod dinosaurs, which were characterized by their three toes and hollow bones.