Geologic Studies in Alaska by the U.S. Geological Survey, 1992

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Table 1. Radiocarbon ages of late Holocene paleosols and other organic material in eolian sand Site Latitude Longitude Sample Material Laboratory Age (fig. 1) number ' (yr B.P.)~ Paleosols related to longitudinal and parabolic dunes - 1 70" 03.9' 153" 31.6' 78ACrlI-099D Humus I-10,891 2,290280 2 70" 16.8' 152" 55.2' 82ACr-224A Humus I-13,041 2,420280 3 70" 26.2' 151" 45.5' 78ACrII-045F Humus I-10,890 1,100+80 3 79ACr- 106 Herbaceous I- 1 1,602 3,690290 plant debris Older radiocarbon ages for site 3 Description - - - Lower half of 25 cm thick humic horizon beneath longitudinal dune (fig. 4). Lower half of 25 cm thick humic horizon beneath longitudinal dune (fig. 6). Humic horizon 10 cm thick 50 cm below top of parabolic dune (fig. 8). Collapsed nest of burrowing rodent 30 cm below base of parabolic dune (fig. 8). 3 70" 26.2' 151" 45.5' 78ACrII-045D Humus I- 10,889 5,7452115 Humic horizon 10 to 20 cm thick developed on eolian sand. Overlain and truncated by sand of a parabolic dune. 3 78ACrII-045B 1 Wood I-10,716 10,2202 150 Wood from eolian sand 1.5 m above base of a 7.5 m coastal bluff. Late Holocene paleosols in eolian sand - - - - -- - -- 4 70" 22.65' 152" 09.2' 78ACrII-046D Peat 1-1 1,489 890275 Thin interbeds of peat and sand in zone 20 cm thick within eolian sand. Occurs 3 m below top of a 16 m river bluff. 5 70" 22.4' 153" 12.2' 77ACrII-002D Peat USGS-380 9402 110 Thin interbeds of peat and sand in zone 25 cm thick within eolian sand. Occurs 2 m below the top of a 27 m river bluff. 6 70" 26.8' 152" 09.0' 81ACr-006 Peat I-12,179 2,130290 Base of 30 cm thick peat within eolian sand. Occurs 1 m below the top of a 6.4 m river bluff. 6 8 1ACr-006 Peat USGS-1381 2,210250 As above. 7 70" 04.4' 15 1" 22.9' 82ACr-074G Peat I-13,075 2,200280 Peat 7 to 15 cm thick within eolian sand. Occurs 0.5 m below the top of a 25 m river bluff. 7 75ACr-022 Peat USGS-I 85 2,280250 As above. 8 69" 41.8' 154" 27.2' 79ACr-074T Peat I- 1 1,920 2,480280 Peat 20 to 30 cm thick within eolian sand. Occurs 1 m below the top of a 23 m river bluff. 9 70" 25.7' 152" 34.2' 81ACr-005B Peat I-12,178 2,500280 Peat about 5 cm thick within eolian sand. Occurs 1 m below the top of a 3 m lake bluff. From Rickert and Tedrow (1967) A 70" 17.0' 154" 43.0' Buried soil I- 1004 3,8402 140 A buried organic horizon beneath a stabilized dune (p. 258- I-, Teledyne Isotopes, Inc., Westwood, N.J. USGS-, U.S. Geological Survey Radiocarbon Laboratory, Menlo Park, Calif. Uncalibrated.
LATE HOLOCENE LONGITUDINAL AND PARABOLIC DUNES IN NORTHERN ALASKA the lower paleosol yielded a radiocarbon age of maximum width, and the top of the dune is about 2 m 2,420+80 yr B.P. (table 1). above the adjacent land surface. The north arm of the At site 3, a 7.6-m-high coastal bluff along Hanison parabolic dune is as much as 3 m thick and the sand is Bay truncates a compound parabolic dune (fig. 7) that underlain by a paleosol 10 to 20 cm thick (fig. 8) opens to the northeast and has a long axis that trends N. composed of sandy humus that has yielded a radiocarbon 78" E. The parabolic dune is 273 m long and 137 m in age of 5,745+115 yr B.P. (table 1). A better maximum METERS 3- 1 ossil tundra mats @aleosols) Eolian sand Cryoturbated sandy humus -$%->'2,29( )*GB~ -- - - - - - - - - --- - --~-Q891)- - -- Enlian sand Figure 4. Diagrammatic cross section showing location of dated paleosol, site 1 (fig. 3). Figure 5. Oblique aerial photograph, looking east-northeast, showing longitudinal dune truncated by lake bluff at site 2. 7
Page 1 and 2: Geologic Studies in Alaska by the U
Page 3 and 4: CONTENTS Introduction Cynthia Dusel
Page 5 and 6: CONTENTS CONTRIBUTORS TO THIS BULLE
Page 7 and 8: GEOLOGIC STUDIES IN ALASKA BY THE U
Page 9 and 10: LATE HOLOCENE LONGITUDINAL AND PARA
Page 11: LATE HOLOCENE LONGITUDINAL AND PARA
Page 19 and 20: DEEP-WATER LITHOFACIES AND CONODONT
Page 25 and 26: Table 1. Locality register for key
Page 27 and 28: Table 1. Locality register for key
Page 37 and 38: LITHOFACIES AND CONODONTS OF CARBON
Page 49 and 50: LITHOFACES AND CONODONTS OF CARBONI
Page 51 and 52: Table 1. Conodont faunules and lith
Page 55 and 56: DEPOSITIONAL SEQUENCES IN ATIGUN SY
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DEPOSITIONAL SEQUENCES IN ATIGUN SY
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U-Pb AGES OF ZIRCON, MONAZITE, AND
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APPEAL FOR NONPROLIFERATION OF ESCA
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FAVORABLE AREAS FOR METALLIC MINERA
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GOLD AND CINNABAR IN HEAVY-MINERAL
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EARLY CENOZOIC DEPOSITIONAL SYSTEMS
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EARLY CENOZOIC DEPOSITIONAL S YSTEM
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RESERVOIR FRAMEWORK ARCHITECTURE, C
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GEOCHEMISTRY OF OPHIOLITIC ROCKS FR
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166 GEOLOGIC STUDES IN ALASKA BY TH
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Table 1. Isotopic ages of intrusive
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Table 1. Isotopic ages of intrusive
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GEOCHEMICAL EVALUATION OF STREAM-SE
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Table 3. Summary of geochemical sig
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GEOCHEMICAL CHARACTER OF UPPER PALE
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RECONNAISSANCE GEOCHEMISTRY OF BASA
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OSTRACODE ASSEMBLAGES FROM MODERN B
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RUBIDIUM-STRONTIUM ISOTOPIC SYSTEMA
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RUBIDIUM-STRONTIUM ISOTOPIC SYSTEMA
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US. GEOLOGICAL SURVEY REPORTS ON AL
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U.S. GEOLOGICAL SURVEY REPORTS ON A
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U.S. GEOLOGICAL SURVEY REPOR TS ON
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REPORTS ABOUT ALASKA IN NON-USGS PU
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REPORTS ABOUT ALASKA IN NON-USGS PU
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Geologic Studies in Alaska by the U.S. Geological Survey, 1992

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