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Major cranial changes during Triceratops ontogeny
It is hypothesized that the changes in horn orientation and epoccipital shape function to allow visual identity of juveniles, and signal their attainment of sexual maturity, in Triceratops.
Extreme Cranial Ontogeny in the Upper Cretaceous Dinosaur Pachycephalosaurus
It is proposed that Dracorex hogwartsia, Stygimoloch spinifer and Pachycephalosaurus wyomingensis are the same taxon and represent an ontogenetic series united by shared morphology and increasing skull length.
Cranial histology of pachycephalosaurs (Ornithischia: Marginocephalia) reveals transitory structures inconsistent with head-butting behavior
It is proposed that cranial display in support of species recognition and communication is a more parsimonious interpretation of the function of the pachycephalosaurid dome.
The first radiometric ages from the Judith River Formation (Upper Cretaceous), Hill County, Montana
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…
THE SMALLEST KNOWN TRICERATOPS SKULL: NEW OBSERVATIONS ON CERATOPSID CRANIAL ANATOMY AND ONTOGENY
The discovery of the smallest Triceratops skull provides a new ontogenetic end member for the earliest stage of ceratopsid cranial development and shows that the cranial ornamentation of the frill and the postorbital horns were not restricted to adults, but began at an early age in this species.
Marine transgressions and the evolution of Cretaceous dinosaurs
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…
Dinosaur Census Reveals Abundant Tyrannosaurus and Rare Ontogenetic Stages in the Upper Cretaceous Hell Creek Formation (Maastrichtian), Montana, USA
It is proposed that mature individuals of at least some dinosaur taxa either lived in a separate geographic locale analogous to younger individuals inhabiting an upland environment where sedimentation rates were relatively less, or these taxa experienced high mortality before reaching terminal size where late stage and often extreme cranial morphology is expressed.
Cranial anatomy and diagnosis of Stygimoloch spinifer (Ornithischia: Pachycephalosauria) with comments on cranial display structures in agonistic behavior
A new skull of Stygimoloch spinifer from the Upper Cretaceous Hell Creek Formation of North Dakota is the most complete specimen discovered to date and confirms a suite of diagnostic characters for the species.
A role for iron and oxygen chemistry in preserving soft tissues, cells and molecules from deep time
- M. Schweitzer, Wenxia Zheng, S. Fakra
- BiologyProceedings of the Royal Society B: Biological…
- 22 January 2014
Iron chelators increased fossil tissue immunoreactivity to multiple antibodies dramatically, suggesting a role for iron in both preserving and masking proteins in fossil tissues, and HB-induced solution hypoxia coupled with iron chelation enhances preservation.
Mesozoic continental vertebrates with associated palynostratigraphic dates from the northwestern Ethiopian plateau
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…