cook-inlet-palynology: table listing the coordinates,geologic units, and geologic age determinations of samples collected in the Cook Inlet study area
Zippi, P. A., and Loveland, Andrea M., 2012, Palynological analysis of 228 outcrop samples from the Kenai, Seldovia, and Tyonek quadrangles, Cook Inlet region, Alaska: Raw Data File RDF 2012-1, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.
This is a Point data set.
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.00001. 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 6378206.4.
The flattening of the ellipsoid used is 1/294.978698214.
Sample names are depicted as follows: 2-digit year, 2-or3-letter collector's initials, 2-3 digit station number, and a 1-letter sample identifier (i.e. 01AA01a). The ends of some station numbers also have a -#, representing meterage in a measured section (i.e. 01AA01-1.1a). There are also several samples that follow the convention: 2-letter 1-digit identifiers representing measured section name and number, followed by a number indicating meterage within the measured section (i.e. AA1-1.1).
|Range of values|
|Range of values|
|not assigned||A geologic formation was not assigned to the sample by the collector.|
|Codeset Name:||Proposed stratigraphic nomenclature for Kenai Group, Cook Inlet|
|Codeset Source:||Geologic unit assignments were based on the nomenclature presented in Calderwood, K.W., and Fackler, W.C., 1972, Proposed stratigraphic nomenclature for Kenai Group, Cook Inlet basin, Alaska: American Association of Petroleum Geologists Bulletin, v. 56, p. 739â€“754.|
|Codeset Name:||GSA Geologic Time Scale|
|Codeset Source:||Walker, J.D., and Geissman, J.W., compilers, 2009, Geologic Time Scale: Geological Society of America|
Confidence is a semi-subjective level determined by several factors, e.g.: 1)overall palynofloral abundance, diversity and preservation, 2)abundance and diversity taxa that are restricted by age, 3)abundance and diversity of taxa indicative of warm or cold climate phases, 4) stratigraphic succession of climate phases and/or ages in a series of stratigraphically constrained samples. A typical low confidence sample would be an isolated single sample with no physical stratigraphic field relationships; and low palynofloral abundance and diversity without age diagnostic taxa and a weak inconclusive climate signature. A typical high confidence sample would come from a long series of samples in a measured section; it (and most of the neighboring samples) would have a high abundance, high diversity palynoflora with age restricted taxa and a strong climatic signature. Note that the vendor did not assign confidence levels for all samples.
This work was supported in part by the STATEMAP program under award numbers #G10AC00321 and #G09AC00177, administered by the U.S. Geological Survey. Additional funding was provided through a Capital Improvement grant from the State of Alaska
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The purpose of this report is to present palynological data collected in the Tyonek, Kenai, and Seldovia quadrangles in the Cook Inlet region of Alaska.
Calderwood, K. W., and Fackler, W.C., 1972, Proposed stratigraphic nomenclature for Kenai Group, Cook Inlet: AAPG Bulletin v. 56.
Data sources used in this process:
The latitude and longitude values in this report were collected with handheld GPS units which are accurate to approximately 4 meters. Formation names were interpreted on the basis of prior geologic mapping. To facilitate accurate analysis, care was taken to collect fresh, unweathered, fracture-free outcrop samples within the study area. Age determinations were made by Pierre Zippi of Biostratigraphy.com, LLC based on climatically driven floral changes and biostratigraphic events. Zippi's error is documented as "confidence level" in his age calls.
The horizontal position accuracy on point data is approximately 4 meters based on the error range in the handheld GPS units used to collect spatial information.
This data set includes all samples submitted for palynology analysis from the study area between the 2006 and 2010 field seasons.
No topologic relationships are present in this data set.
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