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Show 96 : \ 5° grf .^ *- J$ ;^ PLASTOMENUS, Cope. Plastomenus corrngalus, Cope, 1. c., p. 35. Plastomenus fractus, Cope, 1. c., p. 35. Plastomenus catenatus, Cope, 1. c , p. 35. Plastomenus communis, Cope, 1. c , p. 35. Plastomenus lachrymalis, Cope, Report on Vertebrata of New Mexico, Am. Report Chief of Eugrs., 1874, p. 603. Plastomenus Thomasii, Cope. B. ENA, Leidy. Ttwna arenosa, Leidy. DKKMATEMYS, Gray. Dermafemy* cosiilatus. Cope, Vertebrata of Eocene, Geogl. Ex. and Surv. W. of 100th M., 1875, p. 36. EMYS, Broug. Emys latilabiatus, Cope. Emys Sttvensonianus, Cope. HADRIAXUS, Cope. JIadrianus Corsonii, Leidy. PISCES. CLASTES, Cope. Clastes, sp. indet. LAMNA, CUV. Lamna Texana, Roomer. Lamna, sp. indet. OXVRHIXA, Ag. Oxyrhina, sp. indet. GALEOCERDO, M. II. Galeocerdo pristodonlus, Ag. Galeocerdo t adencus, Ag. CARCIIARODON, Ag. Carcharodon, sp. indet. In review, I give the following section of the Eocene rocks of the region west of the Sierra Mad re : 1' eot. Red and gray marls, Green River group 1,500 Saudstone, Green River group 1,000 Green aud black marls, Puerco group 500 Total 3,000 The following is an approximate estimate of the Mesozoic beds in the same region. As they were not accurately measured, the numbers will have to undergo revision. Their relative tbickuess is nearly as given. Uncertain, concealed in the sage- plain 500 Cretaceous No. 4 1,500 Cretaceous No. 3 400 Cretaceous No. 2 1,500 Cretaceous No. 1 • 500 Jurassic 600 " Trias" ( bottom not seen) 1,000 Total 6,000 The Mesozoic beds of this section ( excepting some of the higher members of the Cretaceous) have been examined over extensive areas to the wrest and south by Messrs |