3,469 research outputs found
Bite marks attributable to<i>Tyrannosaurus rex</i>: Preliminary description and implications
No full textErickson, Gregory M., Kenneth H. Olson (1996): Bite marks attributable to Tyrannosaurus rex: preliminary description and implications. Journal of Vertebrate Paleontology 16 (1): 175-178, DOI: 10.1080/02724634.1996.1001129
Assessing dinosaur growth patterns: a microscopic revolution
No full textErickson, Gregory M. (2005): Assessing dinosaur growth patterns: a microscopic revolution. TRENDS in Ecology and Evolution 20 (12): 677-684, DOI: 10.1016/j.tree.2005.08.01
A king-sized theropod coprolite
No full textKaren Chin, Timothy T. Tokaryk, Gregory M. Erickson, Lewis C. Calk (1998): A king-sized theropod coprolite. Nature 393: 680-682, DOI: 10.1038/3146
in millimeters measurements all, specimens rex Tyrannosaurus other and 2523.8 P RSM of measurements Select. 1 TABLE in An Older and Exceptionally Large Adult Specimen of Tyrannosaurus rex
No full textin millimeters measurements all, specimens rex Tyrannosaurus other and 2523.8 P RSM of measurements Select. 1 TABLEPublished as part of Persons, Scott W, Currie, Philip J. & Erickson, Gregory M., 2019, An Older and Exceptionally Large Adult Specimen of Tyrannosaurus rex, pp. 1-17 in The Anatomical Record 302 on page 14, DOI: 10.1002/ar.24118, http://zenodo.org/record/325181
Fig. 5 in An Older and Exceptionally Large Adult Specimen of Tyrannosaurus rex
No full textFig. 5. Pathologic dorsal rib head of RSM P2523.8. Swollen region suggests an incompletely healed injury or infection.Published as part of Persons, Scott W, Currie, Philip J. & Erickson, Gregory M., 2019, An Older and Exceptionally Large Adult Specimen of Tyrannosaurus rex, pp. 1-17 in The Anatomical Record 302 on page 4, DOI: 10.1002/ar.24118, http://zenodo.org/record/325181
Fig. 2. Select vertebrae from RSM P2523.8. A in An Older and Exceptionally Large Adult Specimen of Tyrannosaurus rex
No full textFig. 2. Select vertebrae from RSM P2523.8. A, Dorsal and anterior caudal vertebrae showing variation in the fusion of the neural arch to the centrum. B, The second and third sacral vertebrae, in right lateral view. All scale bars = 10 cm.Published as part of Persons, Scott W, Currie, Philip J. & Erickson, Gregory M., 2019, An Older and Exceptionally Large Adult Specimen of Tyrannosaurus rex, pp. 1-17 in The Anatomical Record 302 on page 3, DOI: 10.1002/ar.24118, http://zenodo.org/record/325181
Bite-force estimation for Tyrannosaurus rex from tooth-marked bones
No full textErickson, Gregory M., Van Kirk, Samuel D., Su, Jinntung, Levenston, Marc E., Caler, William E., Carter, Dennis R. (1996): Bite-force estimation for Tyrannosaurus rex from tooth-marked bones. Nature 382 (6593): 706-708, DOI: 10.1038/382706a
Figure 3 in The Biomechanics Behind Extreme Osteophagy in Tyrannosaurus rex
No full textFigure 3. Tyrannosaurus rex dental functional morphology. (A) Exemplar tooth pressures along the distal 37 mm of the left M5 of BHI 3033 (warmer colours indicate higher pressures), illustrating bone-penetrating shear stresses (>65 MPa4, 39) for almost 25 mm of indentation depth. (B) Mesial and distal facing carinae (white arrows) helped direct pathways of bone fracture towards adjacent maxillary teeth (C) (ventral view of BHI 3033) that were also engaged during indentation, illustrating how the most procumbent maxillary tooth crowns collectively form a fracture arcade (pink arrows) due to pressures generated when biting. (Figure element in (A) derived from digital scan by Virtual Surfaces, Inc).Published as part of Paul M. Gignac & Gregory M. Erickson, 2017, The Biomechanics Behind Extreme Osteophagy in Tyrannosaurus rex, pp. 2012 in Scientific Reports 7 on page 4, DOI: 10.1038/s41598-017-02161-w, http://zenodo.org/record/374893
Figure 4 in The Biomechanics Behind Extreme Osteophagy in Tyrannosaurus rex
No full textFigure 4. Jaw models of Tyrannosaurus rex paired with idealized beam diagrams, illustrating three- (A) (lateral view), (B) (anterior view) and four-point ((C), anterior view) loading configurations that allowed T. rex to promote failure stresses and fracture rigid structures (e.g., bone) without the aid of occluding dentitions. Teeth (cones) and the osseus palate, composed of the right and left maxillae and an anterior expansion of the vomer (rectangle), are shown as contact points in pink; original beam shapes are dark blue; and idealized plastic deformations (exaggerated) are light blue.Published as part of Paul M. Gignac & Gregory M. Erickson, 2017, The Biomechanics Behind Extreme Osteophagy in Tyrannosaurus rex, pp. 2012 in Scientific Reports 7 on page 5, DOI: 10.1038/s41598-017-02161-w, http://zenodo.org/record/374893
Psittacosaurus amitabha Napoli & Hunt & Erickson & Norell 2019, sp. nov.
No full textPsittacosaurus amitabha, sp. nov. ETYMOLOGY: The celestial Amitabha Buddha is the Buddha of infinite light, and one of his attributes is extreme longevity (fig. 1). Amitabha is the principal Buddha of Pure Land Buddhism and is highly venerated in Mongolia. HOLOTYPE: IGM 100 /1132, a nearly complete, undistorted skull with an associated partial mandible and fragmentary postcranial elements. The specimen was discovered by M.A. Norell and J.M. Clark. All elements represented in IGM 100 /1132 are listed in appendix 1, and select measurements are given in table 1. TYPE LOCALITY: Ondai Sayr, Ussuk, Tsaagan Nor basin, Central Mongolia (fig. 2). The Ondai Sayr locality has also been considered the Andakhuduk Formation (Jerzykiewicz, 2000). The age of the locality is generally considered to be Barremian (Jerzykiewicz and Russell, 1991). Other dinosaurian remains have been found at this locality, including juvenile specimens of Psittacosaurus (Coombs, 1982), but vertebrate fossils are extremely rare (M.A.N., personal obs.). A list of all American Museum of Natural History specimens from the Ondai Sayr locality is presented in appendix 2.Published as part of Napoli, James G., Hunt, Tyler, Erickson, Gregory M. & Norell, Mark A., 2019, Psittacosaurus amitabha, a New Species of Ceratopsian Dinosaur from the Ondai Sayr Locality, Central Mongolia, pp. 1-36 in American Museum Novitates 2019 (3932) on pages 3-6, DOI: 10.1206/3932.1, http://zenodo.org/record/459871
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