Fossil frogs of North America have been reviewed by Holman (2003), and records from the middle and late Miocene of North America are relatively numerous. Nonetheless, frog fossils from the late Miocene Clarendonian North American Land Mammal Age time period (ca. 12.5-9 Ma) are rare and biogeographically poorly represented. There is a single record of a bufonid from the Clarendonian Land Mammal Age (LMA) of South Dakota (Holman, 1973), but most of our knowledge of Clarendonian LMA frogs comes from a single local fauna, the Wakeeney Lo cal Fauna (L.F.) of Kansas (Wilson, 1968; Holman, 1975, 2003). In this report we describe an important collection of middle to late Clarendonian (ca. 11-9 Ma; time scale of Woodburne, 2004) frog fossils recovered from the Whisenhunt Quarry fossil site of Beaver County, Oklahoma. The mammals of the Whisenhunt Quarry fossil site have been discussed previously by Dalquest et al. (1996) and, to a lesser degree, by Smith (2005). The Whisen hunt Quarry frogs represent the first lower vertebrates reported from the local fauna, but more importantly they provide new and noteworthy information that improves our knowledge about the diversity and distribution of North American midcontinental frogs from this time period. Fossil Locality?The Whisenhunt Quarry fossil site is located approximately 10 km south of Gate, Beaver County, Oklahoma, in the Laverne Formation at T3N, R28E, Sec. 9, SE 1/4, NW 1/4 (Dalquest et al., 1996; see Fig. 4 for the general location of the site). Late Miocene mammals from this Great Plains formation have been known to science since at least the late 19th century (see discussion in Tedford et al, 2004). Fossils from the Whisen hunt Quarry site were obtained by Dalquest et al. (1996) by pro cessing matrix collected at the quarry in the early 1990s. The ma terial was derived from a stratum of sand and diatomaceous clay, which they (Dalquest et al., 1996:133) believed represented an ancient still-water pool or lake in a marsh or swamp. No ra diometric date (numerical date) is available for the Whisenhunt Quarry, but on the basis of a detailed study of the Whisenhunt Quarry mammals, Dalquest et al. (1996) assigned the local fauna a biochronological age of middle to late Clarendonian LMA. They suggested that the Whisenhunt Quarry L.F. best correlated with the well-documented late Clarendonian Wakeeney L.F. of Kansas. On the basis of megaand micromammal components of the Whisenhunt Quarry and mammals from other nearby Lav erne Formation sites, Tedford et al. (2004) suggested a medial Clarendonian age for the local fauna.