RESEARCH· ·1970·

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STEFANSSON AND OWENS Bl51 EXPLANATION Lowland deposits Upland deposits E St.Marys Fonnation >- H I:J 10 I I I I I I 38° 30' J{ ff Et "'I a.., tYX~ntill Choptank Fonnation Calvert • Formation Nanjemoy Fonnation > a: ~ j:: a: w 1- 0 5 MILES li'IOURE l..-Genernlized geologic map of part of southern Maryland, showing the distribtlltion of Eocene to Holocene formations . . (Modified af.ter Glaser, 1968.)
B152 STRATIGRAPHY at a depth of 58 feet in the core hole (see below), and if the contact of the St. Marys Formation with the overlying sediments is somewhere in the interval 17.1- 24.9 feet, then the total thickness of the St. Marys formation in the core hole is less than 45 feet. The top of the Choptank Formation is placed, on the basis of fossil evidence, at 57 feet below the top of the section measured by Loose (in Glaser, 1968, p. 51-52). In the core, an abundance of fossil shells was noted at a depth of 58 feet, and the top of the Chop tank Formation in the core is therefore considered to be at this depth. The total thickness of the measured section is 99 feet, and therefore only the upper part of the Chop tank could be measured (57 -99 feet). In nearby exposures, the Chop tank Formation has a maximum thickness of about 60 feet (Glaser, 1968). If the maximum thickness of the Choptank Formation is present in the core, then the Choptank Calvert contact should be at a depth of approximately 118 feet. Significantly, there was no core recovery from the interval 113.6:..._121.8 feet. It may be that the lack of core recovery in this interval is due to physical changes at the contact between the two formations. If so, the placing of the Choptank -Cal vert contact at a depth of approximately 118 feet is valid. The maximum known thickness in outcrop of the Calvert Formation is about 180 feet (Glaser, 1968), but in the core it seems to be considerably greater. At a depth of 329.3 feet there is a 0.3-foot bed of glauconite with some carbonaceous fragments. Below this, the core is sandy and glauconitic. Just above the glauconite bed the section is sandy, silty, and clayey for a few feet and contains a few grains of glauconite, probably reworked; above this, the section is clayey. The top of the glauconite bed is considered the top of the Nanjemoy Formation of Eocene age. On the basis of the above inferences, that is, that the top of the Calvert is at a depth of approximately 118 feet and the top of the Nanjemoy at about 329 feet, the thickness of the Calvert Formation in the core hole is approximately 211 feet. SAMPLES About 130 samples were selected from the core wherever obvious physical changes, such as changes in lithology, compaction, and col~r, occurred. The clay fractions from these samples, therefore, represent not only clay but otJher lithologic types found in the core. The samples were disaggregated in distilled water. Rapid flocculation took place in nearly all samples and was inhibited by adding sodium hexametaphosphate to the disaggregated samples. This extreme flocculation of the l\1io.cene clays of southern Maryland has been noted before (J. ,V. Hosterman, oral commun., 1968). An oriented tile for X-ray diffraction analyses was then prepared from the
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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·~~------~~--
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B84 GEOPHYSICS B 600 B' 500 400 (/)
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GE,OLOGICAL SURVEY RESEA·RCH 1970
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EXPLANATION Pikes Peak • batholit
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DISTRIBUTION OF URANIUM IN URANIUM-
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B92 GEOCHRONOLOGY Fleischer, R. L.,
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B94 ECONOMIC GEOLOGY 103° 35' w 1/
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'B96 ECONOMIC ·GEOLOGY 0 500 FEET
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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 and 140: Bl34 PALEONTOLOGY a b c d e f g - D
Page 141 and 142: Bl36 PALEONTOLOGY --- 1963. The ori
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.
Page 155: GE~OLOGICAL SURVEY RESEARCH 1970 CL
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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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Page 191 and 192: B186 ANALYTICAL METHODS 3.31 percen
Page 193 and 194: Bl88 ANALYTICAL METHODS 3" 2%" Oute
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Page 197 and 198: B192 GROUND-WATER RECHARGE I T I 14
Page 199 and 200: B194 GROUND-WATER RECHARGE Therefor
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Page 203 and 204: B198 GROUND-WATER RECHARGE the basi
Page 205 and 206: 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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RESEARCH· ·1970·

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