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

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Table 1. Locality register for key conodonts and lithologic features [Map number indicates measured section or study locality shown on figure 2. Units are keyed to figure 2: LGP, Lisburne Group, platform facies; K, Kuna Formation; A, Akmalik Chert; RB, Rim Butte unit. Letters in field numbers refer to collector: AD, J.A. Dumoulin; AMu, C.G. Mull; JS, J.M. Schmidt; ASi, J.P. Siok; and TR, I.L. Tailleur. CAI, color alteration index] MAP NO. WNITi . , FIELD NO. (USGS COLLN. NO.) LATITUDE NJ LONGITUDE W. KEY CONODONT SPECTES AND LITHOLOGTES Thin-bedded dolostone interbedded with chert, shale, and pisolitic phosphate layers Cavusgnathus unicornis Gnathodus homopunctatus Gnathodus semiglaber Syncladognathus geminus Thin-bedded dolostone interbedded with chert Bisputhodus utahensis Cavusgnathus unicornis Hindeodus sp. indet. Thin-bedded dolostone interbedded with chert Bispathodus utahensis Cavusnnathus unicornis ~~ncladognuthus geminus Crinoidal dolostone Bispathodus utahensis Cavusgnathus unicornis FOSSIL AGE AND CAI I (LGP) I 92AD31G 1 68"37'58"/ middle Late Mississippian 3 (LGp) 4 (LGP) 5 (K) \ , 7(K-Kuna Formation overlying Kayak Shale) 8 (K-Kuna Formation overlying Kayak Shale) 92AD16-227 (3 177 1 -PC) 90AD59C and 85ASi14-18 (3 1734-37-PC and 29892-PC) 90AD62 91AD9E, F (3 1743-PC) 68"37'24 to 37'00"l 156"37'05" to 50" 68"28'45"1 155"42'48" and 68"28'42"/ 1 55"42'2OU 68"34'43"1 (late Meramecian to early Chesterian?); CAI= 1-1.5 early Late Mississippian (late Meramecian); CAI=I-I 5 early Late Mississippian (late Meramecian); CAI=l-1.5 early Late Mississippian (late Meramecian); CAI=]-1.5 157"54'00" 68"23'30"/ Chieflv carbonaceous shale. lesser s~iculitic mudstone and carbonate rocks Chieflv -. s~iculitic mudstone and notable calcitized I I radiolarite I Kuna Formation is predominantly carbonaceous I latest Devonian to Early 157"39'15" shale and lesser spiculitic mudstone and carbonate Mississippian rocks (probably Kinderhookian but 9 1 AD9E-Kayak Shale; bryozoan wackestone could be Osagean; indeterminate bar fragments bisapthodids appear to be longer ranging in northern 9 I AD9F-Kayak Shale, 13 m above 9 1 AD9E; Alaska than elsewhere); skeletal packlgrainstone ~is~athodus? plumulus nodosus (fig. 50 CAI=2-2.5 Kuna Formation: predominantly carbonaceous Early Mississippian; shale and lesser spiculitic mudstone and carbonate CAI indeterminate-rocks conodonts covered with Bispathodus? aff. R. stubilis Pseudopolygnathus sp. indet. fragments of Early Mississippian morphotype amorphous organic matter Kayak Shale: black, very fine grained limestone associated with black shale Bispathodus aff. B. aculeatusplumulus fragment Poly,qnathus sp. indet. fragment Mississippian (Osagean to Chesterian) latest Devonian to Early Mississippian (late Famennian to Osagean), probably Kinderhookian; REMARKS Near top of Lisbume Group, no more than 20 m below top. Five meters below exposed top (probably actual top) of Lisburne Group and 5 m below 92AD71; base of overlying Siksikpuk Formation concealed. At exposed top (probably actual top) of Lisburne Group; base of overlying Siksikpuk Formation concealed. Measured section of the Lisburne Group (305 m) Measured section of the Lisbume Group (-220 m); see Dumoulin and Harris (this volume) for description of section and conodont faunas. Contact between Lisburne Group and Siksikpuk Formation concealed. Conodont samples from limestone interval in uppermost part of Kayak Shale; contact between Kayak Shale and Kuna Formation concealed. uppermost part of the Kayak Shale. The concretions contain a variety of mollusks, including ammonoids that have not yet been dated. F % R p m .e 4 3 v,
Table 1. Locality register for key conodonts and lithologic features-Continued MAP NO. (m 9 (K) 10(K) 1 I (K-Kuna Formation overlying Kayak Shale) 12(K) 13 (K-Kuna Formation overlying Kayak Shale) 14 (K-Kuna Formation overlying Kayak Shale) 15 (A) FIELD NO. (USGS COLLN. NO.) 90AD41 91JS19 9 1 JS25F (3 1752-PC) 91JS25C (31751-PC) 91JS27 90AD65S (30941-PC) 90AD650 (30942-PC) 91 ADIY (3 1738-PC) 91ADIA (3 1739-PC) 91TR17 (3 172 1 -PC) 91Tr30C (3 1767-PC) LATlTLTDE NJ LONGITUDE W. 68"20'00"/ 1 57"44'3OU 68"20'52"/ 156"04'20" 68"20'08"1 155"52'4SU 68" 19'28"l 155O52'55" 68"20'00"/ 155"48'20" 68" 19'4S"/ 155"42'20" 68"19'48"/ 15S030'55" 68"37'05"/ 157"36'00" 68"37'30"1 157"33'10" KEY CONODONT SPECTES AND LITHOLOGTES Carbonaceous shale, spiculitic mudstone, and notable carbonate concretions. Chiefly spiculitic mudstone and lesser carbonate rocks and carbonaceous shale Kuna Formation: chiefly spiculitic mudstone and lesser carbonate rocks Bispathodus srabilis or B. utahensis Kayak Shale: bioclastic quartz sandstone layer Polygnarhus? sp. indet. fragment Chiefly spiculitic mudstone and lesser carbonate rocks Kuna Formation: chiefly spiculitic mudstone, lesser carbonate rocks, and minor shale bispathodid or hindeodid mid-platform fragment Bispathodus urahensis Kuna Formation: chiefly spiculitic mudstone and lesser carbonate rocks and shale; rare bioturbated horizons and productid brachiopods (storm deposits) Bispathodus utahensis (fig. 5A-0 Idioprioniodus sp. Kladognarhus sp. Bispathodus utahensis Black limestone interbedded with chert 1 M and 1 Sc elements of Mississippian morphotype Calcitized radiolarite interbedded with chert Bispathodus urahensis (fig. 7A-0 Gnathodus semiglaber (fig. 7H-J) Mestognathus pmebeckmanni (fig. 7K-M) FOSSIL AGE AND CAI latest Devonian to Mississippian (late Famennian to Meramecian), probably Mississippian CAI=-2; conodonts covered with amorphous organic matter Late Devonian to Early Mississippian (probably Kinderhookian) CAI=2 or 3 latest Devonian to Mississippian (late Famennian to Meramecian), probably Mississippian; CAI=2.5-3 Mississippian (Osagean to Meramecian); CAI=2.5-3 Mississippian (Osagean to Meramecian); CAI=3 Mississippian CAIz1.5-2 late Early Mississippian (Osagean, but not earliest) CAI=1.5 REMARKS Type section of the Kuna Formation Reference section of the Kuna Formation: 90AD65S: 15 m above exposed base of formation. 90AD650: 45 m above exposed base of formation. Most conodonts are partly to nearly completely coated with amorphous organic matter. Measured section about 23.5 m thick; Kuna Formation appears to overlie relatively continuous section of Kayak(?) Shale and Kanayut Conglomerate; top of Kuna not exposed. 91 AD1 Y: 12.25 m above base of measured section; 9 1 AD I A; 2 1 m above base of measured section. Sample 91ADIY is representative of the bispathodid biofacies and is probably a postmortem lag concentrate because most ramiform elements are missing and those that do occur are relatively complete. Bispathodus utahensis platform elements are extremely abundant and most are complete. From Bion barite deposit. Conodont sample about 25 m below chert containing Late Mississippian or Early Pennsylvanian radiolarians.
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 19 and 20: DEEP-WATER LITHOFACIES AND CONODONT
Page 23: DEEP-WATER LITHOFACIES AND CONODONT
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
Page 65 and 66: U-Pb AGES OF ZIRCON, MONAZITE, AND
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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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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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