RESEARCH· ·1970·

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DOWNEY B135 anterior face of upper P 2 (Hibbard, 1939, p. 506); however, recent work by Hibbard ( 1969) has shown that P'ratilelJU8 vag'lt8 jr01n the Hagerman local fauna displays only one ttnterior ena1nel fold on the anterior face of upper P 2 • It is quite possible that this feature is characteristic of all species of the genus P1·atilep'lt8. The genus P1·ati.le1J'lt8 is considered to be the ancestral stock fr01n which the genus Al'lt'l·alag'ltS was derived (Downey, 1968). In view of this derivation, the genus Al'lwalag'ltS would be expected to display features on the occlusal surface of the upper P 2 that are similar to those found on the sa1ne tooth of the genus P1·atile1nts, and the upper P!! originally assigned to the genus Al'lt'ralag'lt8 (Downey, 1968, fig. 2c) may be fr01n n species of N ek1·olag'lt8. It should be noted that the genus I/ y.polag'lts also has an upper P!! with one enmnel reentrant on the occlusal surface, and separation of isolated P 2 's of P1·atilep'lt8 and AlJu1·alag'lt8 fr01n llylJolag'ltS is somewhat difficult where they occur together in the same fauna. Lower Pa's with an enamel pattern sin1ilar to that displayed by the genus H YlJolag'lt8 are absent in material collected fr01n the Curtis Ranch area ; however, Hypolag'ltS does occur in the nearby middle Pleistocene Tusker local fauna fr01n the Safford valley (Downey, 1962; 'Vood, 1963). The upper second premolar assigned to the genus Al'lwalag'lt8 fr01n the Curtis Ranch local fauna is similar in size to. the upper P 2 's assigned to Hypolagus from the Tusker fauna; however, the P!! . from the Curtis Ranch fauna displays a deeper anterior ena1nel fold on the ttnterior surface than what is found in the Tusker IlylJolag'ltS. In addition, the enamel reentrants of premolars P 3 and P·1 are crenulated in the Curtis Ranch 1naterial, whereas the material assigned to I1ylJOlag'lt8 collected fr01n the Tusker site (Downey, 1962, fig. 1n) did not show crenulations at any stage of wear. Genus :LEPUS Linnaeus, 1758 Lepus near L. californicus Gray 1flg~res 3a, e-g 1\ 1~ortion of the fossil n1aterial collected at the Curtis Ranch locality represents a large hare similar to the 1nodern form Le1nts califm·nimts con1n1on in the Southwest. The specimens, a left P 3, UA 1375; right P3, UA 1379; an upper right jaw fragment with P 2 -:~P, UA 137.4; and a lower left ja.w frag1nent with P3-l\f 1 UA 1377, were collected from the sediments in which A. '1;i1•giniae occurs. Fron'il. the general structure and ena1nel pattern of the cheek teeth, a fortn very close to L. califm".nimts is suggested. The posteroexternal enamel reentrant of lower P.3 in both specimens crosses the occlusal surface of the tooth almost to the lingual wall. Both specimens also show a persistent anterior enamel fold on lower P 3· A species near LelJ'ltS californimts occurs in the middle Pleistocene Tusker local fauna (fig. 1) fron1 near Safford, Ariz. (Do'wney, 1962; 'Vood, 1963). The ·Tusker Lepus is similar in many respects to the material assigned to Lepus from the Curtis Ranch fauna'; however, the posterior external reentrant on lower P 3 of the Tusker fonn is s01new hat n1ore c01nplex. The forward projecting ena1nel fold on the posteroexternal reentrant of lower P 3 is less pronounced on the 1naterial assigned to Lepus fr01n the Curtis Ranch fauna. C01nparison of the Curtis Ranch specimens with specimens of Lepus calijm"'tic'ltS shows the Curtis Ranch for1n to be in the smne size range, and the configuration of the enatnel patterns displayed by both the lower P 3's and the upper P!! assigned to Lep'ltS definitely verifies .the generic assignment of this ·1naterial. Bryan, Kirk, 1926, San Pedro Valley, Arizona, and the geographic cycle [abs.] : Geol. Soc. America Bull., v. 37, p. 169-170. Dawson, 1\f. R., 1958, Later Tertiary Leporidae of North America: Univ. Kansas Paleont. Gontr., Vertebrata, art. 6, p. 1-75. Downey, J. S., 1962, Leporidae of the Tusker local fauna from southeastern Arizona: Jour. Paleontology, v. 36, no. 5, p. 1112-1115. -- 1968, Late Pliocene Lagomorphs of the San Pedro valley, Arizona, ·in Geological Survey Research 1968: U.S. Geol. Survey Prof. Paper 600-D, p. D169-D173. Gazin, C. L., 1942, The late. Cenozoic vertebrate faunas from the San Pedro valley, Arizona: U.S. Natl: Mus., Proc., v. 92, no. 3155, p. 475-517. Gidley, J. "'·· 1922, Preliminary report on fossil vertebrates of the San Pedro valley, Arizona, with descriptions of new species of Rodentia and Lagomorpha: U.S. Geol. Survey Prof. Paper 131-E, p. 119-131. -- 1926, Fossil Proboscidea anQ. Edentata of the San Pedro valley, Arizona: U.S. Geol. Survey Prof. Paper 140-B, p. 83-94. Gilluly, James, 1956, General geology of central Cochise County, Arizona: U.S. Geol. Survey Prof. Paper 281, 169 p. Gr.ay; R. S., 1967, Petrography of the upper Cenozoic nonmarine sediments in the San Pedro valley, Arizona: Jour. Sed. Petrology, v. 37, no. 3, p. 774-789. Hibbard, C. ,V., 1939, .Fol.u· new rabbits from the upper Pliocene of Kansas: Am. l\Iidland Naturalist, v. 21, no. 2, p. 506-513. -- 1941, l\Iammals of the Rexroad fauna from t'he upper Pliocene of southwestern Kansas : Kansas Acad. Sci. Trans., v. 4~, p. 265-313. -- 1949, Pleistocene vertebrate paleontology in North Amer· ica: Geol. Soc. America Bull., v. 60, p. 1417-1428. -- 1958, Summary of North American Pleistocene mammalian local faunas:: Michigan Acad. Sci. Papers, v. 44, p. 3- 32.
Bl36 PALEONTOLOGY --- 1963. The origin of the Pa pattern of SylvilaUtts, Oap?·olag·us, 01·yctoUtgtt8, and Leptts: Jour. l\'Iammalogy, v. 44, no. 1, p. 1-:-15. --- 1969, The rabbits (Hypolagus and Pratilepus) from the upper Pliocene, Hagerman local fauna of Idaho: Michigan Academician, v. 1, nos. 1 and 2, p. 81-97. Lance, .J. F., 1960, Stratigraphic and structural position of Cenozoic fossil localities in Arizona : Arizona Geol. Soc. Digest, v. 3, p. 155-159. Melton, M. A., 1960, Origin of the drainage and geomorphic history of southeastern Arizona : Arizona Univ., Arid Lands Colloquia, p. 8-16. Wood, P. A., 1963, Pleistocene fauna from the 111 Ranch area, Graham County, Arizona: Univ. Arizona, unpub. Ph.D. thesis, 121 p. Zimmermann, R. C., 1969, Plant ecology of an arid basin, Tres Alamos-Redington area southeastern Arizona: U.S. Geol. Survey Prof. Paper 485-D, 51 p.
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. ., GEOLOGICAL SURVEY RESEARCH·
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CONTENTS GEOLOGIC STUDIES Petrology
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GEOLOGICAL SURVEY RESEARCH 1970 Geo
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B2 PETROLOGY AND PETROGRAPHY for bi
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B4 PETROLOGY AND PETROGRAPHY has be
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B6 PETROLOGY AND PETROGRAPHY. 32
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B8 PETROLOGY AND PETROGRAPHY TABLE
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BlO · PETROLOGY AND PETROGRAPHY EX
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GE,OLOGICAL SURVEY RESEA·RCH 1970
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B16 PETROLOGY AND PETROGRAPHY Sprin
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B20 PETROLOGY AND PETROGRAPHY Sigva
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B22 PETROLOGY AND PETROGRAPHY EXPLA
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B24 PE~ROLOGY AND PETROGRAPHY schis
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B28 PETROLOGY AND PETROGRAPHY sg•
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B30 PETROLOGY AND PETROGRAPHY Detri
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B32 PETROLOGY AND PETROGRAPHY place
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B34 PETROLOGY AND PETROGRAPHY 66 '
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B36 PETROLOGY AND PETROGRAPHY Post-
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B40 PETROLOGY AND PETROGRAPHY did n
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B42 PETROLOGY AND PETROGRAPHY Creta
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td :t 106'20' r--- 10' 106'00' 38'3
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B46 STRUCTURAL GEOLOGY FIGURE 4.-Vi
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B48 STRUCTURAL GEOLOGY FIGURE 6.-An
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B50 STRUCTURAL GEOLOGY clined slide
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GE,OLOGICAL SURVEY RESEARCH 1970 CA
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B54 GEOPHYSICS (1950), Domzalski (1
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B56 GEOPHYSICS STRATIGRAPHY AND LIT
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B58 GEOPHYSICS STRATIGRAPHY AND LIT
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B60 GEOPHYSICS value. A normal free
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B62 GEOPHYSICS Hammer, Sigmund, 193
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B64 110°45' GEOPHYSICS L I I \ "'\
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GE·OLOGICAL SURVEY RESEA·RCH 1970
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B68 GEOPHYSICS A' San 0 p A c I F I
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B70 GEOPHYSICS lies occur over rela
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B72 GEOPHYSICS 36° 00' A' 40___./
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B74 GEOPHYSICS igneous massif is co
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B76 GEOPHYSICS A 50 Bouguer gravity
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GE·OLOGICAL SURVEY RESEARCH 1970 R
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B80 GEOPHYSICS FIGURE 1.-Bouguell'
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B82 GEOPHYSICS J I 37·~~------~~--
Page 89 and 90: B84 GEOPHYSICS B 600 B' 500 400 (/)
Page 91 and 92: GE,OLOGICAL SURVEY RESEA·RCH 1970
Page 93 and 94: EXPLANATION Pikes Peak • batholit
Page 95 and 96: DISTRIBUTION OF URANIUM IN URANIUM-
Page 97 and 98: B92 GEOCHRONOLOGY Fleischer, R. L.,
Page 99 and 100: B94 ECONOMIC GEOLOGY 103° 35' w 1/
Page 101 and 102: 'B96 ECONOMIC ·GEOLOGY 0 500 FEET
Page 103 and 104: B98 ECONOMIC GEOLOGY TABLE !.-Summa
Page 105 and 106: BlOO ECONOMIC GEOLOGY surface seems
Page 107 and 108: GE 1 0LOGICAL SURVEY RESEA·RCH 197
Page 109 and 110: B104 EJrucJh of the four samples wa
Page 111 and 112: B106 ECONOMIC GEOLOGY R. 56 E. R. 5
Page 113 and 114: B108 ECONOMIC GEOLOGY outcrop under
Page 115 and 116: BllO Brady, of the Museum of Northe
Page 117 and 118: Bll2 PALEONTOLOGY FIGURE 1.-ProtobZ
Page 119 and 120: B114 PALEONTOLOGY c .,;# I I ' ' lO
Page 121 and 122: B116 PALEONTOLOGY ments, the larges
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Page 125 and 126: B120 L xMH 'xE soo~~B_R~I __ T_I __
Page 127 and 128: B122 PALEONTOLOGY Tetrataxis sp. Te
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Page 131 and 132: Bl26 PALEONTOLOGY TABLE 2.-Ranges o
Page 133 and 134: B128 PALEONTOLOGY l
Page 135 and 136: BI30 PALEONTOLOGY Ocmt/rrence.-P. m
Page 137 and 138: Bl32 PALEONTOLOGY proximately 5.7 m
Page 139: Bl34 PALEONTOLOGY a b c d e f g - D
Page 143 and 144: B138 PALEONTOLOGY core are m1ssmg,
Page 145 and 146: B140 PALEONTOLOGY death assemblage:
Page 147 and 148: Bl42 STRATIGRAPHY EXPLANATION l:.\.
Page 149 and 150: B144 STRATIGRAPHY ver. We do not in
Page 151 and 152: B146 STRATIGRAPHY age. A stratigrap
Page 153 and 154: B148 5 10 15 20 X X Plntygonus Pla.
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Page 157 and 158: B152 STRATIGRAPHY at a depth of 58
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Page 161 and 162: B156 STRATIGRAPHY REFERENCES Brown,
Page 163 and 164: B158 STRATIGRAPHY In what follows,
Page 165 and 166: Bi60 STRATIGRAPHY TABLE !.-Stratigr
Page 167 and 168: B162 SEDIMENTATION with increasing
Page 169 and 170: llj ...... ~ TABLE 2.-Specific grav
Page 171 and 172: B166 TABLE 3.-Settling time for a 1
Page 173 and 174: Bl68 GEOMORPHOLOGY 74° 44° YERMON
Page 175 and 176: B170 GEOMORPHOLOGY have also been r
Page 177 and 178: B172 GEOMORPHOLOGY end of Long Isla
Page 179 and 180: GEOLOGICAL SURVEY RESEARCH 1970 DET
Page 181 and 182: ~ooo ______________ B176 ANALYTICAL
Page 183 and 184: B178 terranes where the search for
Page 185 and 186: B180 Reproducibility Replicate anal
Page 187 and 188: B182 ANALYTICAL METHODS in the aque
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B186 ANALYTICAL METHODS 3.31 percen
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Bl88 ANALYTICAL METHODS 3" 2%" Oute
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GEOLOGICAL SURVEY RESEA~RCH 1970 TR
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B192 GROUND-WATER RECHARGE I T I 14
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B194 GROUND-WATER RECHARGE Therefor
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GEOLOGICAL SURVEY RESEARCH 1970 PRE
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B198 GROUND-WATER RECHARGE the basi
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B200 GROUND-WATER RECHARGE t \ \)
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B202 GROUND-WATER RECHARGE Water is
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B204 GROUND-WATER CONTAMINATION rv
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B206 GROUND-WATER CONTAMINATION TAB
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B208. GROUND-WATER CONTAMINATION fa
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GEOLOGICAL SURVEY RESEARCH 1970 MEA
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B212 SURFACE WATER plotted, and the
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GEOLOGICAL SURVEY RESEA·RCH 1970 T
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B216 SURFACE WATER however, if the
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B218 SURFACE WATER TABLE 4.-Variati
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B220 RELATION· BETWEEN GROUND eral
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B222 -0.010 f -0.005 (i) RELATION B
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GEOLOGICAL SURVEY RESEARCH 1970 THE
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'B226 RELATION BETWEEN GROUND WATER
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B228 RELATION, BETWEEN GROUND WATER
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B230 RELATION BETWEEN GROUND WATER
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GEOLOGICAL SURVEY RESEARCH 1970 HYD
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B234 EROSION AND SEDIMENTATION side
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B236 EROSION AND SEDIMENTATION s·o
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B238 EROSION AND SEDIMENTATION Cont
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B240 EROSION AND SEDIMENTATION 2 3
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GEOLOGICAL SURVEY RESEARCH 1970 SPE
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B244 GEOCHEMISTRY OF WATER REFERENC
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B246 HYDROLOGIC TECHNIQUES The upla
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B248 HYDROLOGIC TECHNIQUES type in
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GEOLOGICAL SURVEY RESEARCH 1970 ,,.
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B252 formula may also be useful in
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GEO'LOGICAL SURVEY RESEARCH 1970 CO
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B256 randomly fluctuating component
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B258 HYDROLOGIC TECHNIQUES 1.0 ~ Qj
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~ B260 HYDROLOGIC TECHNIQUES 1-3, f
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I B262 HYDROLOGIC TECHNIQUES REFERE
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,' B264 Page Gravitational sliding,
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., / )
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