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David J. Varricchio
Montana State University
80Publications
28H-index
2,519Citations
Publications 83
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#1Giulio Panascí (MSU: Montana State University)
#2David J. Varricchio (MSU: Montana State University)H-Index: 28
Last.Ren Hirayama (Waseda University)H-Index: 15
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Abstract An incomplete specimen assigned to the genus Neurankylus sp. was collected from Coniacian deposits of the Frontier Formation of Montana (USA). The material consists of anterior plastron, a costal plate and neural plate fragment, and several undetermined skeletal elements. The identification is based on the relatively large size of the specimens, scute elements joining along the mid-line of the plastron with the intergulars reaching the humerals, and complete fusion of the sutures. The s...
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#1Ashley W. Poust (University of California, Berkeley)H-Index: 3
#2Chunling Gao (AMNH: American Museum of Natural History)H-Index: 9
Last.Fengjiao Zhang (AMNH: American Museum of Natural History)
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#1William J. Freimuth (MSU: Montana State University)
#2David J. Varricchio (MSU: Montana State University)H-Index: 28
Abstract We describe the diversity and abundance of insect (specifically hymenopterans and coleopterans) pupation structures in the Upper Cretaceous (Campanian) Two Medicine Formation at the Egg Mountain locality, western Montana, U.S.A., an important dinosaur nesting site. The study interval comprises a massive calcareous siltstone and indurated silty limestone horizons interpreted as the product of cumulative paleosols. A 7 m by 11 m area was quarried with a jackhammer at intervals of 12.5 cm ...
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#1L. J. Krumenacker (ISU: Idaho State University)H-Index: 1
#2David J. Varricchio (MSU: Montana State University)H-Index: 28
Last.Ashley L. Ferguson (ISU: Idaho State University)
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Abstract Vertebrate assemblages from the mid-Cretaceous (Albian-Cenomanian) Wayan Formation of Idaho and Vaughn Member of the Blackleaf Formation of Montana are dominated by the small burrowing dinosaur, Oryctodromeus cubicularis. Specimens can be assigned to three distinct taphofacies dependent on degrees of skeletal articulation and associated lithofacies. Taphofacies A comprises mostly to fully articulated specimens in bioturbated sandstones. Taphofacies B comprises partially articulated to a...
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#1Christian Thomas Heck (OSU: Oklahoma State University–Stillwater)H-Index: 1
#2David J. Varricchio (MSU: Montana State University)H-Index: 28
Last.John R. Horner (Chapman University)H-Index: 44
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1 CitationsSource
#1John P. WilsonH-Index: 1
#2David J. Varricchio (MSU: Montana State University)H-Index: 28
ABSTRACTOryctodromeus cubicularis is a small-bodied ornithischian dinosaur from the mid-Cretaceous Blackleaf and Wayan Formations of Montana and Idaho, respectively, and is the only documented dino...
1 CitationsSource
#1Lucas N. Weaver (UW: University of Washington)H-Index: 1
#2Gregory Wilson (UW: University of Washington)H-Index: 22
Last.David J. Varricchio (MSU: Montana State University)H-Index: 28
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ABSTRACTDuring the mid-Cretaceous, multituberculate mammal communities were restructured, as ‘plagiaulacidan’ multituberculates, common from the Middle Jurassic through Early Cretaceous, began to b...
1 CitationsSource
Last.David J. VarricchioH-Index: 28
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#1David J. Varricchio (MSU: Montana State University)H-Index: 28
#2Martin Kundrát (University of Pavol Jozef Šafárik)H-Index: 12
Last.Jason Hogan (MSU: Montana State University)H-Index: 1
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Non-avian dinosaurs such as oviraptorosaurs and troodontids share several important reproductive characters with modern birds, including eggshell microstructure and iterative egg production. Nevertheless, debate exists concerning their incubation strategies. Here we estimate incubation period for the troodontid, Troodon formosus, by examining a near-term embryonic tooth. Synchrotron scanning and histologic thin sections allowed counting of daily (von Ebner) growth lines. The tooth preserves 31 i...
4 CitationsSource
#1Ashley L. Ferguson (ISU: Idaho State University)
#2David J. Varricchio (MSU: Montana State University)H-Index: 28
Last.Alex J. Ferguson (UIdaho: University of Idaho)
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Nesting localities of extant birds and reptiles may provide taphonomic models for interpreting nesting sites of ancient archosaurs. Here we describe assemblages of nesting gulls (Larus delawarensis and L. californicus), American white pelicans (Pelecanus erythrorhynchos), and double-crested cormorants (Phalacrocorax auritus). Seventy nests yielded 2752 skeletal elements and 2308 eggshells. Most material was located inside the nest for gulls and consisted of osteologically mature gull bones and p...
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