Blying Sound
N
W
BS-1
Granite
K-Ar
Biotite
Granite of Harding Icefield region, southern tip of Aialik Peninsula, recalculated with new Constants (Steiger and Jager, 1977).
Tysdal and Case, 1979; Lytwyn and others, 2000
Muscovite
Cordova
67APr 1
Granitic rock
Phlogopite
Location revised
Winkler and Plafker, 1981, Plafker and others, 1985; Nelson and others, 1985
71APr 25C
Hornblende
Winkler and Plafker, 1981, Plafker et al, 1985; Nelson and others, 1985
Cordova1
Granodiorite
Tysdal et al, 1976,  Plafker and Lanphere, 1974,  Plafker, 1974
85APr 140
Dacite
Whole-rock
Dacite porphyry
Plafker, written communication, 1986
72APr 2A3
Basalt
Recalculated with 1976 constants
84APr 9
71APr 20B
Winkler and Plafker, 1981; Nelson and others, 1985
71APr 20C
Tonalite
85ANk 96B
Gabbro
Plafker, written communication, 1986; Winkler and Plafker, 1993
84APr 8
Minimum age
71APr 22c
Winkler et al, 1981; Nelson and others, 1985
71APr 23A
Amphibolite
Greenschist facies amphibolite, location revised
83APr 312
Diabase
Johnstone Cove, excess argon, recalculated with 1976 constants
Kenai
7-14-73-3
Ash
Fission-track
Zircon
Kenai Peninsula, Sterling Formation.  Age revised in Turner and others (1980).
Triplehorn et al, 1977; Turner et al, 1980a
Plagioclase
62ALe 6e
Quartz diorite
Rounded granitic boulders within the Chisik Conglomerate member of the Naknek Formation
Detterman et al, 1965,  Magoon et al, 1976
Rounded granitic boulders within the Chisik Conglomerate member of the Naknek Formation, recalucated age w/Steiger and Jager (1977) constants
Detterman et al, 1965,  Magoon et al, 1976, Wilson and others, 2006
7-13-73-9
Kenai Peninsula, location revised, Sterling Formation.  Age revised in Turner and others (1980).
7-13-73-6
DT75-200
Sterling Formation, Clamgulchian Stage
Turner et al, 1980a
62ALe 5
Alaska-Aleutian Range batholith, recalc. with 1976 constants
Detterman et al, 1965, Reed and Lanphere, 1969, 1972, Magoon et al, 1976
Detterman et al, 1965, 1976, Magoon et al, 1976, Reed and Lanphere, 1969, 1972
DT75-201
Tuff
Crystal tuff, Sterling Formation.  Mean of 2 splits
70AR 175
Age recalculated with 1976 constants.  Age suspect, may be reset by younger plutonism.
Reed and Lanphere, 1972, 1973,  Magoon et al, 1976,  Detterman et al, 1976
70AR 177
Age recalculated with 1976 constants
Reed and Lanphere, 1972, 1973, Detterman et al, 1976, Magoon et al, 1976
70AR 178
Reed and Lanphere, 1972, 1973,  Magoon et al, 1976
70AR 146
70AR 173
Diorite
66AR 1464
Quartz monzonite
Reed and Lanphere, 1969, 1972, 1973,  Magoon et al, 1976,  Detterman et al, 1976
70AR 156
70AR 158
70AR 147
70AR 140
70AR 179
Middleton Island
72APr 76A1
Basaltic dike rock from Kayak Island.  Analytical data does not match reported age.
Seldovia
7AF23-9
Schist
Quartz-mica schist, approximate location, recalculated using Steiger and Jager, 1977 constants
Carden et al, 1977
74PG79
SD3-3
Greenschist
Actinolite
Approximate corrected location, recalculated using Steiger and Jager, 1977 constants
Forbes and Lanphere, 1973, Magoon et al, 1976, Carden et al, 1977
Chlorite
Mica
Approximate corrected location, white mica concentrate, recalculated using Steiger and Jager, 1977 constants
Forbes and Lanphere, 1973,  Magoon et al, 1976, Carden et al, 1977
74AF4B.1
Amphibole
Blueschist, crossite date, approximate location, recalculated using Steiger and Jager, 1977 constants
74AF23-10
Amphibole-mica schist, approximate location, recalculated using Steiger and Jager, 1977 constants
SD9-3
Crossite
Blueschist, crossite date, argon loss?, approximate location, recalculated using Steiger and Jager, 1977 constants
PH
Blueschist, possible argon loss, approximate location, recalculated using Steiger and Jager, 1977 constants
7-21-73-1
Kenai Peninsula, Beluga? Formation.  Age revised in Turner and others (1980).
7-21-73-5
DT75-203
Apatite
Crystal vitric tuff mostly altered to clay, Beluga Fm.
Crystal vitric tuff mostly altered to clay, Beluga Formation.  Mean of 2 analyses.
DT75-202
Crystal vitric tuff, Beluga Formation
DT75-204
Beluga Formation
Beluga Formation.  Mean of 2 analyses
7-22-73-4
DT75-210
DT75-211
20-40m stratigraphically above DT75-210.  Sterling Formation.
Also dated 14.1 m.y., 20-40m stratigraphically above DT75-210.  Sterling Formation; age may be too old due to detrital contamination.
DT75-212
Also dated 30.1 m.y., 33m stratigraphically above DT75-211.  Sterling Formation; age may be too old due to detrital contamination.
DT75-209b
Also dated at 8.2 Ma.  Sterling? Formation, age may be too old due to detrital contamination.
DT75-206
Composite of four thin beds, Sterling Formation
Also dated at 8.4 m.y., composite of four thin beds.
DT75-207
24m stratigraphically higher than DT75-206.  Sterling Formation
24m stratigraphically higher than DT75-206.  Believed to be too old due to detrital contamination.
DT75-208
35m stratigraphically higher than DT75-206.  Sterling Formation
35m stratigraphically higher than DT75-206.  Sterling Formation.
6-25-77-1
78AR 290DK
Andesite
Dark band in banded andesite
Reed, Lanphere and Miller, 1992
78AR 290LT
Light band in banded andesite
90AR 99
Estimated latitude and longitude
92AKu 71b
40/39 Plateau
Tustemena pluton - medium-grained, nonfoliated biotite granodiorite.   Sample run by Lux.
Bradley and others, 1999, 2000
88ACy 9
40/39 Isochron
Nuka pluton - medium- to coarse-grained granodiorite containing biotite, muscovite, and rare hornblende.  Sample run by Clendenen and Heizler.
Bradley and others, 1999; 2000; Lytwyn and others, 2000
88ADw 230
Intermediate dike
A leucocratic porphyry dike containing feldspar and hornblende phenocrysts that cuts the McHugh Complex near the head of Seldovia Bay.  Sample run by Clendenen and Heizler.
Bradley and others, 1992; 1999; 2000
93ASB 66
Basaltic andesite
Hornblende-phyric basaltic andesite dike cutting graywacke of McHugh Complex 4km SE of the head of Tutka Bay. Sample run by Lux.
Bradley and others, 1999; 2000
91AKu 3 #1
Aialik pluton, Harris Bay.  One of three biotite analyses.
Bradley and others, 2000
U-Pb
Monazite
Nuka pluton - medium- to coarse-grained granodiorite containing biotite, muscovite, and rare hornblende.  Sample run by Parrish.
91ADw 55g
Chernof Stock - nonfoliated, medium-grained biotite granodiroite.  Sample run by Lux.
91AKu 3
40/39 Average
Aiallik pluton - medium- to coarse-grained granodiorite.  Sample run by Layer.  Quadrangle incorrect in source
95TD 2b #3
Hive Island pluton - granodiorite.  One of three biotite analyses run by Layer.
92PH 454B
Thunder Bay granitic sill, slightly disturbed spectrum
Haeussler and others 1995;  Bradley and others, 2000
Also dated 11.7 m.y., 20-40m stratigraphically above DT75-210.  Sterling Formation; age may be too old due to detrital contamination.
Also dated at 9.1 Ma.  Sterling Formation; age may be too old due to detrital contamination.
Also dated 32.2 m.y., 33m stratigraphically above DT75-211.  Sterling Formation; age may be too old due to detrital contamination.
Also dated at 4.6 m.y., composite of four thin beds.  Sterling Formation age may be too old due to detrital contamination.
81BS 001A
Metatuff
Whole Rock
Map unit Kvt on Fox Island.
Miller, 1984 (M.L. Silberman, USGS, unpub. data, 1982)
81BS 011A
81BS 011B
81BS 013K
92ATi 316D
White Mica
Seldovia metamorphic complex, Plateau age
Bradley and Karl, 2000, A. Till (per. commun., 2007)
92ATi 309B
Barroisite
Seldovia metamorphic complex, Plateau age, qtz-wht mica-chorite schist
80ANS 148A
K/Ar
Unit Tgg south side of Miles Glacier
Nelson and others, 1985 (Vivit, Gray, Silberman)
80AMH 159A
Whole rock
Dacite of Cape St. Elias
Nelson and others, 1985 (Teledyne Isotopes)
85APr 177
Hornblended
Altered clinopyroxene gabbro in written report, reported as hornblende gabbro on map
George Plafker, written commun., 1986; Winkler and Plafker, 1993
72APr 22A1
Recalculated with constants of Steiger and Jager (1977)
n.a.
Felsic dike
40/39
White mica
Port Dick prospect, hydrothermal alteration preferred date from single step (1000 degrees C) and 67.8 percent of gas
Haeussler and others, 1995
Not reported
Sericite
Valdez Group, Beauty Bay Mine, altered rock, clear sericite
Valdez Group, Beauty Bay Mine, altered rocks, gold-colored sericite.  Preferred date based on 37.2 percent of gas, disturbed spectra
Vein
Thunder Bay gold occurrence, polymetalllic gold-sulfide vein
91AKu 3 #2
91AKu 3 #3
95TD 2b #2
95TD 2b #1
95TD 2b
Hive Island pluton - granodiorite.  Weighted mean of three biotite analyses run by Layer.
Paguna
Paguna stock, approximate location.
Bradley and others, 1999
Replicate analysis, Amphibole-mica schist, approximate location, 1976 constants
90ADW 809
Andesite dike, might have intruded Port Graham formation near Port Graham
Lytwyn and others, 2000