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Table of Formations of Graham Island and Neighbouring Districts 3

i 1 . . . by
Graham island Southeastern Alaska? Iliamna region® Cook inlet and Alaska peninsula* Matanuska valley, Alaska® Fairbanks quadrangle, Alaska’ Skeena river, B.C* Vancouver island? SHITE Glin
System, etc. : a : ;
} |
|| Formation Lithological character Formation _Lithological character Formation Lithological character Formation Lithological character Formation Lithological character Formation Lithological character Formation Lithological character Formation Lithological character Borman Ele re! GEaenics
| H le: | | |
Quaternary Glacial till, and stratified Gravels, sands and clays, Recent volcanic material. | Alluvium Till, sands, and gravels. Glacial deposits. i Glacial till and unconsoli- |
gravels, sands, and clays. | glacial drift. Beach and flood-plain de-! Terrace gravels | | dated! gravels, sands, and |
| ; posits. Terrace gravels. || Unconformity |Morainic deposits || Unconformity I clays, mostly stratified.
Unconformity Glacial deposits. | || Unconformity
| |
‘ Pliocene Mees ; Sees flows, tuffs, and | Basaltic flows and tuffs. (?) Basaltic lavas, breccias, and|/Tertiary(?) Basalt |
8 ormation agglomerates. nCon nfor mity farlii,
ce) : TP CST a a
& Miocene Skonun Sandstones, conglomerates, Sedimentary beds. Ken lEska Conglomerate Sooke and Carnanah|Conglomerates and sand-
formation and shales, with marine formation formation \Oligocene ? Sandstone, conglomerate, formations stones.
: fossils and lignite. | shale, and coal. (Oligocene ?)
Unconformity Unconformity |
Eocene Etheline : Intrusive dacite and andesite.||Kenai series Friable sandstones, con- Chickaloon Shale and sandstone, coal foe Eocene ( ?) \Conglomerate, sandstone, and| Tertiary ? |
formation glomerates, shales, and formation® ing; arkose and conglomerate shale, with some lignitic||Bulkley erup- |Granodiorite, diorite- | i
coal seams. Unconformity Unconformity | coal beds. tives porphyrite. | |
Upper Cretaceous/Queen Char- |Fossiliferous sandstones, Sandstones, shales, and Like the Kenai, but with some Shale and sandstone Carbonaceous shales, send Nanaimo series Conglomerates, sandstones, Allison (Belly Soft light grey sandstones.
lotte series shales, and conglomerates, coals (Kuiu island). marine shales and sandstone. stone, and conglomerates. | and shales, with coal. River) ? Chiefly dark shales.
with coal. Benton ? Analcite pyroclastics.
Unconformity Unconformity Crowsnest volcanics.|Chiefly greenish sandstones.
Unconformity Dakota( ?) formation,
Lower Cretaceous Gravina series; Conglomerates and shales. Shales and sandstones with Limestone '|Skeena series Shales, sandstones, con- OSHS Samos ORAS Oy Gee
(Mesozoic ?) Aucella crassicolis. glomerate, and coal. formation seams.
Kasaan Green- Unconformity
stone (Mesozoic ?)|Intrusives and extrusives.
Unconformity Unconformity |
ESE AS AEG AS ASS ve enw tet | VRS nein ses NITAL eNCeneE POLE rene | se acl
Upper Jurassic Batholithic in-|Quartz diorite, etc. Coast Range intru-|Diorites, granodiorites, and||Naknek formation Naknek Conglomerate, sandstone, ar- Shale, sandstone, and conglom- ||Batholithic and dyke Granodiorites, quartz }
RS) trusives, etc. sives (Probably granites. — formation kose, and shales with andesitic erate intrusives. diorites, etc.
°° Jurassic) Chisic conglomerate. flows. Jurassic Andesite flows and sand-
3 Tah Ge ALe 10 Soe a ROR ee a oe Hazelton stone, shales, and tuffs.||-—-——_
Ss Middle Jurassic || Yakoun Agglomerates, tuffs, and flows Chinitna shale Enockkin Shales and sandstones with some} Sandstone and shale | group Sicker series Andesitic flows and tuffs;
formation Tuxedni sand- formation conglomerate beds. : (Jurassic or schistose slaty tufaceous
stone. : | Triassic). and quartzose sediments.
Unconformity
Lower Jurassic _|| Maude Dark coloured, fine-grained, Granitic rocks. Tuffs and sandstones Andesitic greenstone, tuffs, ag- Sutton formation, |Crystalline limestones, met-||Fernie formation _| Dark shales with a few thin
formation thinly laminated fossilifer- Porphyries and tuffs. glomerates, and breccias; Vancouver vol- amorphic andesites, and sandstone beds.
ous argillites, grading up- Unconformity rhyolites. canics. pyroclastic rocks. |
SS ward into tuffs and agglom- EES }
Upper Triassic erates. Possibly detrital Kamishak chert. Thin-bedded cherts, limestones
conglomerates at base. oo and shales, base not seen.
Limestone
| SSS SS =
Lower Triassic | | Nitinat formation (?
1 This report. 2 A. H. Brooks, U.S.G.S. Prof. Paper 45, p. 206. 3G. C. Martin and F. J. Katz, U.S.G.S. Bull. 485, p. 30. 4. W. Stanton and G. C. Martin, Bull. Geol. Soc. America, vol. 16, 1904, pp. 391-410. 5G. C. Martin and F. J. Katz, U.S.G.S. Bull. 500, p. 15. 6 Carries Kenai flora. 7L. M. Prindle, U.S.G.S. Bull. 525, p.34. 8 W. W. Leach, Geol. Surv., Can., Sum. Rept., 1910, p. 93.
9 C. H. Clapp, Geol. Surv., Can., Mem. 13, pp. 36-37. 10 W. W. Leach,Twelfth Inter. Geol. Cong., Guidebook No. 9, p. 23.

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