...David J. Varricchio; Frankie D. Jackson; Robert A. Jackson; Darla K. Zelenitsky Abstract Using tangential thin sections, we examined variation in porosity and water vapor conductance across two eggs of Troodon formosus , a small (∼50 kg) theropod dinosaur from the North American Upper Cretaceous...

...Table 1. Troodon formosus (upper) and Latenivenatrix mcmasterae (lower) specimens discussed in this paper. ...

...Jason D. Hogan; David J. Varricchio Abstract Troodon formosus , a theropod from the Late Cretaceous, is one of the few species of dinosaurs with multiple nest sites uncovered. It has been consistently demonstrated that eggs within these nests would have been partially buried in life—an exceedingly...

...Philip J. Currie; Xi-Jin Zhao Abstract A new, well-preserved specimen of Troodon formosus is the first to reveal the internal anatomy of the lower part of the braincase. In addition to providing new information on the brain of this highly encephalized dinosaur, the uncrushed bones clear up...

...Fig. 4. (A) TLM view of Troodon formosus eggshell (MOR 246). Note the ubiquitous presence of a surficial diagenetic layer of calcite capping the eggshell in the upper part of the picture and a faint pale line (arrow) subdividing the external region of the eggshell. Both artifacts could...

... encore qu’il n’existe qu’un seul taxon de troodontidés dans le Campanien de l’Alberta. [Traduit par le Rédaction] Troodon formosus (Leidy 1856) was one of the first dinosaurs described in North America and early in its history was considered as a lacertilian (Leidy 1856), a megalosaurid...

... material, but no teeth ( Russell 1969 ). Because the genotype of Troodon is an isolated tooth ( Leidy 1856 ) from potentially coeval beds of the Judith River Formation ( Mallon et al. 2016 ), it remains possible that T. inequalis is a junior synonym of T. formosus , since teeth collected from...

...; iii, dorsal; iv, ventral); ( c ) left dentary of “ Troodon formosus ” ( Currie 1987 ) from the Horseshoe Canyon Formation (Campanian–Maastritchian), Drumheller, Alberta (TMP 1983.012.0011) (i, lingual; ii, labial; iii, dorsal; iv, ventral); ( d ) left dentary of cf. Stenonychosaurus inequalis from...

... of theropod teeth found to date. FIGURE 1 —The Late Cretaceous dinosaur localities in northern Alaska that provided specimens used in this study are within the dashed box along the Colville River between Umiat and Ocean Point. Troodon formosus was one of the first dinosaur taxa named in North...

.... Horner J.R. 1997 , Nest and egg clutches of the dinosaur Troodon formosus and the evolution of avian reproductive traits : Nature , v. 385 , p. 247 – 250 . Varricchio D.J...

... shell units are visible in radial view, and the prismatic layer to mammillary layer thickness ratio is about 5:1, similar to P. levis (∼6:1) ( Varricchio et al. 2002 ). Eggs of the ootaxon Prismatoolithus levis have been ascribed to Troodon formosus , based on associated skeletal remains...

...Figure 3. Transverse mid-diaphyseal sections of extinct Dinosauria. A, Femur of embryonic Orodromeus cf. makelai. B, Femur of embryonic Troodon cf. formosus. C, Femur of embryonic cf. Maiasaura peeblesorum. D, Femur of embryonic cf. Hypacrosaurus stebingeri. E, Enlarged view...

.... 2008 ; Varricchio et al. 2013 ) combine taphonomic analysis of a nesting trace with calculation of G H2O in order to interpret dinosaur nesting behavior. Further, only one theropod nesting trace ( Troodon formosus) has been identified using sedimentologic characteristics ( Varricchio et al. 1997...

... to Stenonychosaurus inequalis by Russell (1969) , and morphologically similar material also recovered from the Dinosaur Park Formation of southern Alberta (e.g., AMNH 6174, TMP 1979.008.0001, CMN 12340). This material has subsequently been referred to Troodon formosus ( Currie 1985 , 1987 a ; Makovicky...