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Troodontidae / t r oʊ. ə ˈ d ɒ n t ɪ d iː / is a clade of bird-like theropod dinosaurs from the Late Jurassic to Late Cretaceous.During most of the 20th century, troodontid fossils were few and incomplete and they have therefore been allied, at various times, with many dinosaurian lineages.
The oldest alvarezsauroid known from South America Alvarezsaurus: 1991 Bajo de la Carpa Formation (Late Cretaceous, Santonian) Argentina: One of the largest known alvarezsaurids Amargasaurus: 1991 La Amarga Formation (Early Cretaceous, Barremian to Aptian) Argentina
At this stage, paravian distribution concentrated mostly on the northern hemisphere, with exceptions of avialae found in South America and Australia. [ 7 ] The iconic Jehol Biota found in Yixian Formation and Jiufotang Formation in Inner Mongolia yielded fossils of early avialans including enantiornithes (a subclass of birds) [ 36 ] and small ...
More than 260 dinosaur footprints discovered in Brazil and Cameroon provide further evidence that South America and Africa were once connected as part of a giant continent millions of years ago.
Troodon (/ ˈ t r oʊ. ə d ɒ n / TROH-ə-don; Troödon in older sources) is a former wastebasket taxon and a potentially dubious genus of relatively small, bird-like theropod dinosaurs definitively known from the Campanian age of the Late Cretaceous period (about 77 mya).
Fossils may be found either associated with a geological formation or at a single geographic site. Geological formations consist of rock that was deposited during a specific period of time. They usually extend for large areas, and sometimes there are different important sites in which the same formation is exposed.
The new fossil is the first to be discovered so far north in South America, and was found after over 100 years of research at the La Venta badlands, a fossil site in Colombia, the researchers said.
Catherine Forster and others found that troodontids were the sister group of the avialans. [2] Sereno defined the Troodontidae as all taxa more closely related to Troodon formosus than to Velociraptor mongoliensis. [14] 1999. Fernando Emilio Novas and others reported a possible troodontid specimen from Coniacian to Turonian-aged sediments in ...