Preliminary Report on Upper Cenozoic Carbonaceous Deposits in the Johnson River Area, Alaska Range

Benninghoff, William S.; Holmes, George W.

doi:10.3138/9781487584979-052

Cited by 4 publications

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“…In the following description of map units, the tabular references to fossil and age localities refer to the tables in that report. Fossil studies have been published for parts of the quadrangle by Mendenhall (1905), Moffit (1912Moffit ( , 1942Moffit ( , 1954, Benninghoff and Holmes (1961), Rose (1965Rose ( , 1966aRose ( , b, 1967, Rose and Saunders (1965), Richter (1966), Wolfe (1966Wolfe ( , 1972, Rowett (1969Rowett ( a, b, 1975, Rowett and Timmer (1973), Petocz (1970), Richter and Dutro (1975), Bond (1976), Matteson, (1973, Stout (1976), Richter and others (1977), Turner and others (1980), and others (1982, 1985). Isotopic studies are published for parts of the quadrangle by Ragan andHawkins, 1966, Holmes andFoster (1968), Kleist (1971), Matteson (1973), Smith and Turner (1973), Turner and Smith (1974), Bond (1976), Turner and others (1980), Foley (1982Foley ( , 1984, Aleinikoff (1984), Aleinikoff and Nokleberg (1983, 1984, 1985a, LeHurray and others (1985), Aleinikoff and others (1981Aleinikoff and others ( , 1984Aleinikoff and others ( , 1986…”

Section: Previous Studiesmentioning

confidence: 99%

Preliminary geologic map of the Mount Hayes quadrangle, eastern Alaska Range, Alaska

Nokleberg¹,

Aleinikoff²,

Lange³

et al. 1992

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Section: Previous Studiesmentioning

confidence: 99%

Preliminary geologic map of the Mount Hayes quadrangle, eastern Alaska Range, Alaska

Nokleberg¹,

Aleinikoff²,

Lange³

et al. 1992

Open-File Report

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“…Carbonaceous silt and clay were also deposited in local basins, such as the basins that formed near the Johnson River. The Nenana Gravel is regarded as Oligocene or Miocene, probably Miocene (Wahrhaftig, 1958, p. 12), and the carbonaceous silt and clay are considered to be Pliocene (Benninghoff and Holmes, 1961).…”

Section: His Contributions To General Geologymentioning

confidence: 99%

Geologic reconnaissance along the Alaska Highway, Delta River to Tok Junction, Alaska

Holmes¹

1965

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The area along the final 100 miles of the Alaska Highway lies in the middle section of the Tanana lowland and includes parts of the Yukon-Tanana upland on the northeast and the Alaska Range on the southwest. The major bedrock units, mostly exposed in the mountains and hills, are the Birch Creek Schist, regarded as Precambrian; granitic rocks of Cretaceous age; and volcanic rocks of Tertiary age. Very small exposures of lower Tertiary shale, sandstone, and conglomerate crop out along the Tanana River near Tok Junction; a small bed of Nenana Gravel of middle Miocene age or younger lies on the north end of Independent Ridge; and thick but limited carbonaceous silt and clay beds of upper Tertiary age lie along a tributary of the Johnson River. Most of the Tanana lowland and of the piedmont of the Alaska Range is covered by glacial and alluvial deposits. The most conspicuous glacial deposits are the large, well-preserved moraines at the mouths of the major tributaries of the Tanana River. Spreading northward from these moraines are outwash plains that coalesce laterally with alluvium from nonglacial streams to form extensive fan aprons. Most fan aprons are composed of rocks from the Alaska Range, but the fan in the Tok Junction area contains large percentages of volcanic rocks which are not abundant locally. Smaller moraines occur in tributary valleys and in cirques. Two major Pleistocene glaciations are indicated by moraine sequences, which are correlated with the Delta and Donnelly advances of the Delta River area. Other surficial deposits of considerable areal extent are the terrace sediments of the Tanana River and its major tributaries and the eolian loess, which covers nearly all other deposits and rocks. Alluvial silt, eolian sand, colluvium, organic silt, and flood-plain alluvium are also widespread but are mainly confined to valleys. Rubble and talus are of limited extent, occurring at high altitudes in the mountains.

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“…Fossil studies were published for parts of the quadrangle by Mendenhall (1905), Moffit (1912Moffit ( , 1942Moffit ( , 1954, Benninghoff and Holmes (1961), Rose (1965Rose ( , 1966aRose ( , b, 1967, Rose and Saunders (1965), Richter (1966), Wolfe (1966Wolfe ( , 1972, Rowett (1969a, b;1975), Rowett and Timmer (1973), Petocz (1970), Richter and Dutro (1975), Bond (1976), Matteson, (1973), Stout (1976), Richter and others (1977), Turner and others (1980), others (1982, 1985), and Busch (1983).…”

Section: Introductionmentioning

confidence: 99%

Map, tables, and summary of fossil and isotopic age data, Mount Hayes Quadrangle, eastern Alaska range, Alaska

Nokleberg¹,

Aleinikoff²,

Dutro³

et al. 1992

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Preliminary Report on Upper Cenozoic Carbonaceous Deposits in the Johnson River Area, Alaska Range

Cited by 4 publications

References 0 publications

Preliminary geologic map of the Mount Hayes quadrangle, eastern Alaska Range, Alaska

Preliminary geologic map of the Mount Hayes quadrangle, eastern Alaska Range, Alaska

Geologic reconnaissance along the Alaska Highway, Delta River to Tok Junction, Alaska

Map, tables, and summary of fossil and isotopic age data, Mount Hayes Quadrangle, eastern Alaska range, Alaska

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