yukon-flats-core-descriptions: Tabulated file that provides geographic location, core hole numbers, age estimates, core fragment depth, general lithology, grain size, and facies interpretation of of core fragments recovered from a series of core holes drilled by Exxon (mid-80s) in the uplands bordering the Yukon Flats basin.
LePain, D.L., and Montayne, Simone, 2017, Core fragment descriptions, Exxon core holes, uplands bordering Yukon Flats basin, east-central Alaska: Raw Data File RDF 2016-4, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
This is a point data set.
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.001. Longitudes are given to the nearest 0.001. Latitude and longitude values are specified in decimal degrees.
The horizontal datum used is North American Datum of 1927.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.40000000037.
The flattening of the ellipsoid used is 1/294.978698199999997.
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Core hole numbers assigned by Exxon drilling crews: SA85-22, SA85-23, SA85-24, SA85-25, SA85-26, SA85-26 , SA85-27, SA85-28, SA85-29, SA85-30, SA85-31, SA86-3, SA86-4, SA86-5, SA86-6, SA86-7, SA86-8, SA86-9, SA87, SA87-1, SA87-10, SA87-11, SA87-12, SA87-2, SA87-3, SA87-4, SA87-5, SA87-6, SA87-7, SA87-8, and SA87-9
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Characters 1 to 254 of a brief location description.
Age interpretations assigned by Exxon drilling crews include: Devonian, Early Eocene, Early-Middle Eocene, Jurassic(?) , Jurassic(?)-Cretaceous, Late Paleocene or (?) Early-Middle Eocene, Late Paleocene or (?) Eocene, Late Triassic, Late Triassic or Early to Middle Jurassic, Middle to Late Albian, Neogene, Oligocene, Paleocene , Paleocene or Eocene, Paleogene, Paleogene(?), Permian, Pre-Tertiary, Pre-Tertiary?, Tertiary, or Triassic
Examples of lithologic interpretations include: argillaceous sandstone; argillaceous silt; argillaceous siltstone; argillite; argillite and sandstone; argillite and siltstone; argillite?; calcite vein fill; carbonaceous claystone and coal; carbonaceous mudstone; carbonaceous shale; carbonaceous shale?; clay; clayey siltstone; claystone; claystone and carbonaceous shale; coal; coal and carbonaceous mudstone; coal and sandstone; conglomerate; conglomerate and sandstone; conglomerate or pebbly sandstone; conglomerate?; lignite; limestone; massive paper shale; metasediment?; mudstone; mudstone-carbonaceous mudstone; paper shale; pebbly sandstone; phyllite or slate; quartzite; sandstone; sandstone and coal; sandstone and conglomerate; sandstone and siderite?; sandstone and siltstone; sandstone-siltstone; sandstone?; sandy conglomerate; schist; schist and quartzite; shale; shale, siltstone, and sandstone; shaley silt; silt; silt and sandstone; siltstone; siltstone and conglomerate; siltstone and sandstone; siltstone and silty claystone; siltstone claystone; siltstone or sandstone; siltstone-sandstone; silty carbonaceous shale; silty clay; silty clay and coal; silty clay and sandstone; silty claystone; silty sand; silty sand-sandy silt; silty sandstone; silty shale; silty shale-siltstone; silty shale?; and slate?
Examples of grainsize interpretations include: clay; clay and silt; clay to uf; clay, silt, lvf; clay, trace silt?; clay-granule; clay-lm; clay-lvf; clay-silt; clay-silt-lvf-uvf; clay-silty; clay-silty-uvf; clay-uf; clay-uvf; clay-uvf-lf; coal; granule-pebble; granule-pebble and uvf-uf; lc-granule; lc-lvc and pebble; lc-uvc and granule to pebble; lc-uvc and pebble; lf; lf and uf-lm; lf-lm; lf-uc; lf-uf; lf-uvf; lignite; lm and pebble; lm to granule; lm-pebble; lm-uc; lm-um; lm-uvc; lm-uvf; lm?; lvc-uvc to granule; lvf; lvf and uvf; lvf to lf; lvf to pebble; lvf to uvf; lvf-lf; lvf-silt; lvf-uvf; pebble; pebble and silt; pebble and um sand; sand; shale; shale-silt; silt; silt and lf; silt and lm-um; silt and lvf; silt and sand; silt and uvf; silt or lvf; silt to clay; silt to lvf; silt-clay; silt-lf; silt-lvf; silt-lvf-uvf; silt-uvf-lf; siltstone; siltstone to lvf; siltstone-lvf; uc to granule; uc-uvc to pebble; uf; uf to lc; uf-lm; um to pebble; um-lc; um-uc; um-uvc; uvf; uvf to uf; uvf-lc; uvf-lf; and uvf-uf
Characters 1 to 254 of a brief sample description.
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Characters greater than 254 of the sample description.
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Characters greater than 254 of the depositional facies interpretation
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Characters 1 to 254 of a brief description.
In addition to the core fragment descriptions provided in the RDF, reconnaissance fieldwork was done in support of the USGS assessment. The field team included Rick Stanley (USGS party chief), Jim Clough (DGGS), David LePain (DGGS), and Rocky Reifenstuhl (DGGS). Core samples belong to the Doyon Native regional corporation and, at the time of this writing, are stored in Fairbanks, Alaska. Doyon, Limited, gave DGGS permission to examine the core fragments. Mike Tolbert of Taiga Ventures provided core fragment layout space in the Taiga Ventures office in Fairbanks, and Chris Puchner introduced LePain to the core material. Funding for DGGS's work on this project was provided by the State of Alaska.
This Raw Data File provides lithologic descriptions of core fragments recovered from a series of core holes drilled by Exxon (mid-80s) in the uplands bordering the Yukon Flats basin. In addition to descriptions of the material, the tabulated file includes geographic location, core hole numbers, an age estimate, core fragment depth, general lithology, grain size, and facies interpretation. The author examined these core materials in Fairbanks during winter and spring 2002. This work was done in preparation for an assessment carried out by the U.S. Geological Survey of undiscovered, technically recoverable hydrocarbon resources in the Yukon Flats basin.
LePain, D.L., and Stanley, R.G., 2017, Reconnaissance sedimentology of selected tertiary exposures in the upland region bordering the Yukon Flats basin, east-central Alaska: Preliminary Interpretive Report PIR 2016-6, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Reifenstuhl, R.R., 2006, Yukon Flats basin, Alaska: Reservoir characterization study: Report of Investigation RI 2006-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
A ten power (10X) hand lens and standard grain size comparator were used to examine core materials. Dilute hydrochloric acid (HCl) was used to check for calcite and dolomite content. For each sample bag, the author provided a general rock type classification, noted the grain size range according to the Wentworth classification scale (Wentworth, 1922), provided a comprehensive description, and when possible, an interpretation of the depositional facies. In addition to descriptions of the material, the tabulated file includes geographic location, core hole numbers, an age estimate, core fragment depth, general lithology, grain size, and facies interpretation. The accuracy of the information transcribed from the sample bags (core hole numbers, an age estimate, core fragment depth) has not been verified by the author and is unknown.
Paper copies of USGS topographic maps showing core hole locations were provided to the USGS by Doyon, Limited. Maps were scanned, imported into ArcGIS, and georeferenced by USGS staff to provide the latitude and longitude values (NAD27) of each core hole surface intercept. Location errors were not reported.
The subsurface depth of each sample was transcribed from sample bag annotations and presumed to be measured in feet below local ground surface.
This data release is complete.
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|Data format:||ASCII tabular files|