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Extreme Cranial Ontogeny in the Upper Cretaceous Dinosaur Pachycephalosaurus
- J. Horner, M. Goodwin
- Biology, Medicine
- PloS one
- 27 October 2009
Background Extended neoteny and late stage allometric growth increase morphological disparity between growth stages in at least some dinosaurs. Coupled with relatively low dinosaur density in the… Expand
Major cranial changes during Triceratops ontogeny
- J. Horner, M. Goodwin
- Biology, Medicine
- Proceedings of the Royal Society B: Biological…
- 7 November 2006
This is the first cranial ontogenetic assessment of Triceratops, the well-known Late Cretaceous dinosaur distinguished by three horns and a massive parietal–squamosal frill. Our analysis is based on… Expand
Cranial histology of pachycephalosaurs (Ornithischia: Marginocephalia) reveals transitory structures inconsistent with head-butting behavior
- M. Goodwin, J. Horner
- Biology
- Paleobiology
- 20 March 2004
Abstract Modern histological techniques allow paleontologists to investigate the internal microstructure of bone tissue. We apply high resolution images of histological thin sections from an… Expand
The first radiometric ages from the Judith River Formation (Upper Cretaceous), Hill County, Montana
- M. Goodwin, A. Deino
- Geology
- 1 July 1989
A new isotopic age of ca. 78 Ma was obtained by the conventional K–Ar method and by laser-fusion 40Ar/39Ar analysis of biotite and sanidine crystals from two bentonites in the Judith River Formation… Expand
THE SMALLEST KNOWN TRICERATOPS SKULL: NEW OBSERVATIONS ON CERATOPSID CRANIAL ANATOMY AND ONTOGENY
- M. Goodwin, W. Clemens, J. Horner, K. Padian
- Biology
- 30 March 2006
Abstract The discovery of the smallest Triceratops skull (UCMP 154452) provides a new ontogenetic end member for the earliest stage of ceratopsid (Centrosaurinae plus Chasmosaurinae) cranial… Expand
Marine transgressions and the evolution of Cretaceous dinosaurs
- J. Horner, D. Varricchio, M. Goodwin
- Geology
- Nature
- 1 July 1992
FLUCTUATIONS (transgressions and regressions) of intercon-tinental sea-ways during the Mesozoic Era affected the habitat area of coastal plains by alternately restricting the space during… Expand
Cranial Ontogeny in Stegoceras validum (Dinosauria: Pachycephalosauria): A Quantitative Model of Pachycephalosaur Dome Growth and Variation
- Ryan K. Schott, D. C. Evans, M. Goodwin, J. Horner, Caleb M. Brown, N. Longrich
- Biology, Medicine
- PloS one
- 29 June 2011
Historically, studies of pachycephalosaurs have recognized plesiomorphically flat-headed taxa and apomorphically domed taxa. More recently, it has been suggested that the expression of the… Expand
Mesozoic continental vertebrates with associated palynostratigraphic dates from the northwestern Ethiopian plateau
- M. Goodwin, W. Clemens, +5 authors C. R. Schaff
- Geology
- 1999
The East African Rift separates the northwestern and southeastern Ethiopian high plateaus, which are capped by massive Cenozoic volcanics overlying thick deposits of marine and nonmarine Mesozoic… Expand
Dinosaur Census Reveals Abundant Tyrannosaurus and Rare Ontogenetic Stages in the Upper Cretaceous Hell Creek Formation (Maastrichtian), Montana, USA
- J. Horner, M. Goodwin, N. Myhrvold
- Biology, Medicine
- PloS one
- 9 February 2011
BACKGROUND
A dinosaur census recorded during the Hell Creek Project (1999-2009) incorporates multiple lines of evidence from geography, taphohistory, stratigraphy, phylogeny and ontogeny to… Expand
Evolutionary trends in Triceratops from the Hell Creek Formation, Montana
- John B. Scannella, D. Fowler, M. Goodwin, J. Horner
- Biology, Medicine
- Proceedings of the National Academy of Sciences
- 30 June 2014
Significance The deciphering of evolutionary trends in nonavian dinosaurs can be impeded by a combination of small sample sizes, low stratigraphic resolution, and lack of ontogenetic (developmental)… Expand
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