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Coracioidea Look for this name in NCBI Wikipedia Animal Diversity Web
http://palaeo-electronica.org/content/fc-3 Ksepka and Clarke, 2015
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USNM 336484 was collected from the Middle unit of the Fossil Butte Member of the Green River Formation in Wyoming, USA. The minimum date of 51.57 Ma incorporates the error associated with an 40Ar/39Ardate of 51.66 ± 0.09Ma obtained from a potassium-feldspar (K-spar) tuff above the fossiliferous horizon containing USNM 336484 (Smith et al., 2008). Because the tuff was deposited several meters above the fossil horizon, this date can be appropriately treated as a hard minimum. There is no evidence of a substantial temporal gap between the fossil horizon and the tuff (Grande and Buchheim, 1994), and so we conservatively consider time elapsed between the deposition of the fossil and the tuff negligible for the purposes of defining a minimum age.
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Phylogenetic analysis of morphological data (Mayr et al. 2004) and combined morphological and molecular data (Clarke et al. 2009) supports placement of Primobucco mcgrewi as a stem roller.
Mayr, G., Mourer-Chauviré, C., and Weidig, I. 2004. Osteology and systematic position of the Eocene Primobucconidae (Aves, Coraciiformes sensu stricto), with first records from Europe. Journal of Systematic Palaeontology, 2: 1-12.
Clarke, J.A., Ksepka, D.T., Smith, N.A., and Norell, M.A. 2009. Combined phylogenetic analysis of a new North American fossil species confirms widespread Eocene distribution for stem rollers (Aves, Coracii). Zoological Journal of the Linnean Society, 157: 586-611.
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