Vertebrate Paleontology, Paleobiology, Paleoecology

•    B.S. Geology (Paleontology Emphasis), 2004, Northern Arizona University
•    Ph.D. Integrative Biology, 2008, University of California - Berkeley

• Early Mesozoic continental vertebrate ecosystems
• Response of faunas to climate change in deep time
• High-precision radio-isotopic age constraints for the Triassic timescale
• Early Mesozoic tetrapod biogeography and paleoecology
• Basal archosaur and basal dinosaur phylogeny
• Taphonomic processes

Pyenson, Nicholas D., Randall B. Irmis, Jere H. Lipps, Lawrence G. Barnes, Edward D. Mitchell, Jr., and Samuel A. McLeod. In press. Origin of a widespread marine bone bed deposited during the middle Miocene Climatic Optimum. Geology.

Nesbitt, Sterling J., Randall B. Irmis, William G. Parker, Nathan D. Smith, Alan H. Turner, and Timothy Rowe. In press. Hindlimb osteology and distribution of basal dinosauromorphs from the Late Triassic of North America. Journal of Vertebrate Paleontology.

Parker, William G., Michelle R. Stocker, and Randall B. Irmis. 2008. A new desmatosuchine aetosaur (Archosauria: Pseudosuchia) from the Upper Triassic Tecovas Formation (Dockum Group) of Texas. Journal of Vertebrate Paleontology 28(3):692-701.

Irmis, Randall B., and Fabien Knoll. 2008. New ornithischian dinosaur material from the Lower Jurassic Lufeng Formation of China. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 247(1):117-128.

Parham, James. F., and Randall B. Irmis. 2008. Caveats on the use of fossil calibrations for molecular dating. American Naturalist 171(1):132-136.

Irmis, Randall B., Sterling J. Nesbitt, Kevin Padian, Nathan D. Smith, Alan H. Turner, Daniel Woody, and Alex Downs. 2007. A Late Triassic dinosauromorph assemblage from New Mexico and the rise of dinosaurs. Science 317:358-361.

Irmis, Randall B. 2007. Axial skeleton ontogeny in the Parasuchia (Archosauria: Pseudosuchia) and its implications for ontogenetic determination in archosaurs. Journal of Vertebrate Paleontology 27(2):350-361.

Nesbitt, Sterling J., Randall B. Irmis, and William G. Parker. 2007. A critical reevaluation of the Late Triassic dinosaur taxa of North America. Journal of Systematic Palaeontology 5(2):209-243.

Irmis, Randall B., William G. Parker, Sterling J. Nesbitt, and Jun Liu. 2007. Early ornithischian dinosaurs: the Triassic record. Historical Biology 19(1):3-22.