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Browsing by Author "Head, Jason J."

Browsing by Author "Head, Jason J."

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  • The Fossil Calibration Database, A New Resource for Divergence Dating 
    Ksepka, Daniel T.; Parham, James F.; Allman, James F.; Benton, Michael J.; Carrano, Matthew T.; Cranston, Karen A.; Donoghue, Philip C. J.; Head, Jason J.; Hermsen, Elizabeth J.; Irmis, Randall B.; Joyce, Walter G.; Kohli, Manpreet; Lamm, Kristin S.; Leehr, Dan; Patané, José S. L.; Polly, P. David; Phillips, Matthew J.; Smith, N. Adam; Smith, Nathan D.; van Tuinen, Marcel; Ware, Jessica L.; Warnock, Rachel C. M. (2015)
    Fossils provide the principal basis for temporal calibrations, which are critical to the accuracy of divergence dating analyses. Translating fossil data into minimum and maximum bounds for calibrations is the most important, ...
  • Giant boid snake from the Palaeocene neotropics reveals hotter past equatorial temperatures 
    Head, Jason J.; Bloch, Jonathan I.; Hastings, Alexander K.; Bourque, Jason R.; Cadena, Edwin A.; Herrera, Fabiany A.; Polly, P. David; Jaramillo, Carlos A. (2009)
    The largest extant snakes live in the tropics of South America and southeast Asia<U><SUP>1, 2, 3</SUP></U> where high temperatures facilitate the evolution of large body sizes among air-breathing animals whose body ...
  • Unusual Soft-Tissue Preservation of a Crocodile Lizard (Squamata, Shinisauria) From the Green River Formation (Eocene) and Shinisaur Relationships 
    Conrad, Jack L.; Head, Jason J.; Carrano, Matthew T. (2014)
    We describe an unusual squamate fossil from the Green River Formation (Uintan, Eocene) from the Piceance Creek Basin, Colorado, USA. The new specimen, USNM PAL 540708, is a small fossil squamate skin lacking skeletal ...

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