Stigall et al.—A new Oligocene spinicaudatan species from Montana
Estheriteoidea into the Paleogene. The range extension, coupled with the unusual preservation style of E.? jocelynae n. sp. car- apaces, suggests that the weak Cenozoic record of Spinicaudata may be related to preservation bias or perhaps changes in the distribution of lake environments, and thus the geochemistry of lakes, from the Mesozoic to Cenozoic. The presence of E.? jocelynae n. sp. in the Medicine Lodge Formation supports the interpretation that Beaverhead Basin experienced strongly seasonal climate, as inferred from paleobotanical proxies.
Acknowledgments
Useful feedback on an earlier version of this manuscript was provided by C. Haug and T. Hegna. We thank J. Hartman, D. Hembree, and S. Wing for assistance with identifications. J. Utrup and S. Butts atYPMprovided access to their collections and assistance with specimen curation. F. Farelas provided ESEM access at the Ohio University Institute for Corrosion and Multiphase Technology.
Accessibility of supplemental data
Data available from the DryadDigital Repository :
http://dx.doi. org/10.5061/dryad.8217f
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