dc:description"FIG. 2. — Stratigraphy of the Purisima Formation: A, Stratigraphic column of the San Gregorio section of the Purisima Formation (in meters), showing stratigraphic position of UCMP vertebrate localities, dated ash beds, diatom floras, and species of Carcharodon; thickness measurements start over above missing section in uppermost part due lack of overlapping strata; epoch and stage boundaries marked as \"?\" are estimated; modified from Boessenecker (2011a); Pliocene-Pleistocene boundary after Hilgen et al. (2012); B, photograph of 3-4 m thick ash within Purisima Formation at mouth of San Gregorio Creek correlated with 2.5 Ma Ishi Tuff (Powell et al.2007); C, trace fossils in pervasively bioturbated sandstone,Purisima Formation,mouth of San Gregorio Creek; D, swaley cross-stratified sandstone, mouth of San Gregorio Creek. Abbreviations: Qt, Pleistocene terrace deposits; Tp, Purisima Formation; C, claystone; St, siltstone; Ss, sandstone. Scale bars: A, 2 m; B, C, 10 cm.";
dc:description"FIG. 10. — Tympanic bullae of balaenid mysticetes:A, UCMP 219100,partial right tympanic bulla of cf. Eubalaena sp. 1 in medial view; B, UCMP 219100 in dorsal view; C, UCMP 219100 in ventral view; D, UCMP 219099, partial left tympanic bulla of cf. Eubalaena sp. 2 in medial view; E, UCMP 219099 in dorsal view; F, UCMP 219481, fragment of right tympanic bulla of cf. Eubalaena sp. 1 in medial view. Scale bar: 3 cm.";
