U-Pb Isotopic Data and Ages of Detrital Zircon Grains and Graptolite Fossil Data from Selected Rocks from the Western Alaska Range, Livengood area, and Seward Peninsula, Alaska

Identification_Information:

Citation:

Citation_Information:

Originator: Dumoulin, J.A. (ORCID: 0000-0003-1754-1287)
Originator: Jones III, J.V. (ORCID: 0000-0002-6602-5935)
Originator: Bradley, D.C. (ORCID: 0000-0001-9116-5289)
Originator: Till, A.B. (ORCID: 0000-0002-6640-6877)
Originator: Box, S.E. (ORCID: 0000-0002-5268-8375)
Originator: O'Sullivan, P. (ORCID: 0000-0002-7247-5107)
Publication_Date: 20181114
Title:

U-Pb Isotopic Data and Ages of Detrital Zircon Grains and Graptolite Fossil Data from Selected Rocks from the Western Alaska Range, Livengood area, and Seward Peninsula, Alaska - 2018

Geospatial_Data_Presentation_Form: tabular digital data
Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center

Other_Citation_Details:

Suggested citation: Dumoulin, J.A., Jones III, J.V., Bradley, D.C., Till, A.B., Box, S.E., and O'Sullivan, P., 2018, U-Pb Isotopic Data and Ages of Detrital Zircon Grains and Graptolite Fossil Data from Selected Rocks from the Western Alaska Range, Livengood area, and Seward Peninsula, Alaska: U.S. Geological Survey data release, https://doi.org/10.5066/F7PV6JKZ.

Online_Linkage: https://doi.org/10.5066/F7PV6JKZ
Larger_Work_Citation:

Citation_Information:

Neoproterozoic-early Paleozoic provenance evolution of sedimentary rocks in and adjacent to the Farewell terrane (interior Alaska)

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Geosphere
Issue_Identification: v. 14, no. 2, p. 367-394

Other_Citation_Details:

Suggested citation: Dumoulin, J.A., Jones III, J.V., Bradley, D.C., Till, A.B., Box, S.E., and O'Sullivan, P., 2018, Neoproterozoic-early Paleozoic provenance evolution of sedimentary rocks in and adjacent to the Farewell terrane (interior Alaska): Geosphere, v. 14, no. 2, p. 367-394, https://doi.org/10.1130/GES01470.1

Online_Linkage: https://doi.org/10.1130/GES01470.1

Description:

Abstract:

This data set contains two data sets. One data set is of U-Pb isotopic data and associated ages of detrital zircon grains from 16 sedimentary and metasedimentary rocks from the western Alaska Range, Livengood area and Seward Peninsula, Alaska. Two samples were collected from the York Mountains area of the Seward Peninsula of western Alaska. Three samples were collected from the Livengood quadrangle of central Alaska. Eleven samples were collected from the western Alaska Range of south-central Alaska. Detrital zircon grains from each of the sixteen samples were separated and analyzed by Apatite to Zircon, Inc. (A2Z) and Geosep Services (GSS) laboratories between 2011 and 2014, using laser-ablation-inductively-coupled-plasma-mass spectrometry (LA-ICP-MS) techniques.

The second data set contains fossil identifications and age assignments from a select sedimentary rock from the western Alaska Range of south-central Alaska. Fossils were identified by visual inspection.

All samples were collected as part of geological mapping research conducted between 1984 and 2014 and funded by the Mineral Resources Program of the U.S. Geological Survey.

Purpose:

U-Pb isotopic ages of detrital zircon grains from individual sedimentary or metasedimentary rock samples aid in the interpretation of possible sediment sources and pathways during deposition. The youngest detrital zircon ages in any single sample also provide information about the maximum possible depositional age of the sediment and, therefore, the geologic unit that contains it. Comparison of detrital zircon age populations between samples provides a critical test of local to regional correlations of geologic units and aids in the reconstruction of geologic histories of large regions. In this study, the data were used to understand the geologic history of the Neoproterozoic through Devonian Farewell terrane of interior Alaska and to illuminate its early sedimentary history and possible geologic connections with other Alaska terranes.

Fossil identification aids in the interpretation of age, depositional environment, and paleogeography of sedimentary rock units. Comparison of fossil types and ages within and between stratigraphic successions provides a critical tool for age determination and local and regional correlations and, therefore, aids in the reconstruction of geologic histories of large regions. This sample aids in the understanding of the age and geologic history of the Neoproterozoic through Devonian Farewell terrane of interior Alaska and to illuminate its sedimentary history and possible geologic connections with other Alaska terranes.

Detailed interpretations of these data and a discussion of the results and implications of the study can be found in the journal Geosphere (Dumoulin et al, 2017, v. 14, no. 2, p. 367-394, DOI: 10.1130/GES01470.1).

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2018

Currentness_Reference: publication date

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -167.7
East_Bounding_Coordinate: -147.3
North_Bounding_Coordinate: 65.7
South_Bounding_Coordinate: 61.8

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ASC197

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geology
Theme_Keyword: geochronology
Theme_Keyword: uranium-lead analysis
Theme_Keyword: fossils
Theme_Keyword: Ordovician

Theme:

Theme_Keyword_Thesaurus: NASA GCMD Earth Science Keywords Thesaurus
Theme_Keyword: earth science
Theme_Keyword: paleoclimate
Theme_Keyword: land records
Theme_Keyword: macrofossils

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: U-Pb
Theme_Keyword: detrital zircon
Theme_Keyword: graptolite

Place:

Place_Keyword_Thesaurus: USGS Geographic Names Information System (GNIS)
Place_Keyword: State of Alaska
Place_Keyword: York Mountains
Place_Keyword: White Mountains
Place_Keyword: Livengood
Place_Keyword: Alaska Range
Place_Keyword: Trimokish Hills
Place_Keyword: Terra Cotta Mountains
Place_Keyword: Revelation Mountains

Access_Constraints: None
Use_Constraints:

None. Users are advised to read the metadata for the dataset thoroughly to understand appropriate use and data limitations.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey, Alaska Science Center
Contact_Person: James V. Jones, III

Contact_Position: Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 4210 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508-4626
Country: U.S.A.

Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov

Native_Data_Set_Environment:

Original data stored as an Excel spreadsheet in a Windows operating environment and has been exported to comma separated values (csv) file.

Cross_Reference:

Citation_Information:

Originator: Haeussler, Peter J. (ORCID: 0000-0002-1503-6247)
Publication_Date: 2009
Title: Western Alaska Range Metallogeny and Tectonics
Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center

Online_Linkage: https://alaska.usgs.gov/portal/project.php?project_id=302

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: geology_geochronologyData_FarewellTerrane_dumoulin_2018
Entity_Type_Definition:

Table of U-Pb detrital zircon LA_ICP-MS data, reporting the concentration of the radioactive elements uranium (U) and thorium (Th) measured in each grain, corrected ratios of two isotopes of lead (207Pb and 206Pb) to two isotopes of uranium (235U and 238U), and the geologic age of each grain calculated from the isotope ratios. The table is presented in comma separated value (CSV) format.

Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: USGS_Sample_Number
Attribute_Definition:

Sample field id assigned by USGS collector. Value is unique to a sample but is repeated many times in this table because many individual zircon grains from a single sample are analyzed. Descriptive and locational information about the sample is in table Geology_geochronologySummary_FarewellTerrane_dumoulin_2018, and may be linked through field SAMPLE.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Unique sample identifier consisting of the last two digits of the year, abbreviation identifying the collector, and a number and possible suffix.

Attribute:

Attribute_Label: A2Z_Sample_NUMBER
Attribute_Definition:

Laboratory id assigned by Apatite to Zircon, Inc. There is a one to one correspondence to USGS_Sample_Number.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Unique identifier supplied by the laboratory

Attribute:

Attribute_Label: Mineral
Attribute_Definition: Material analyzed
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: DZ
Enumerated_Domain_Value_Definition: detrital zircon
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute:

Attribute_Label: Analysis_Name
Attribute_Definition: Unique lab identifier for an individual analysis
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

In most cases this is the concatenation of A2Z_Sample_NUMBER (hyphen excluded), characters AZ1, an underscore, and a sequential number representing an individual analysis of the sample. In many cases the character string AZ1 is omitted.

Attribute:

Attribute_Label: U_conc
Attribute_Definition: Concentration of uranium (U), in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 4385
Attribute_Units_of_Measure: parts per million (ppm)

Attribute:

Attribute_Label: Th_conc
Attribute_Definition: Concentration of thorium (Th), in parts per million (ppm)
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 3670
Attribute_Units_of_Measure: parts per million (ppm)

Attribute:

Attribute_Label: U_Th_ratio
Attribute_Definition:

Ratio of U/Th, or the concentration of uranium, U_conc, divided by concentration of thorium, Th_conc.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 208.41
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: 207Pb_235Uc_Ratio
Attribute_Definition:

Ratio of 207Pb/235U, or lead isotope 207 divided by uranium isotope 235 for concordant (c) scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 32.50927
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: 207Pb_235Uc_Unc
Attribute_Definition:

Value is 2-sigma uncertainty for the ratio 207Pb/235U for concordant (c) scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 17.74226
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: 206Pb_238U_Ratio
Attribute_Definition:

Ratio of 206Pb/238U, or lead isotope 206 divided by uranium isotope 238 for concordant (c) scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 0.58395
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: 206Pb_238U_Unc
Attribute_Definition:

Value is 2-sigma uncertainty for the ratio 206Pb/238U for concordant (c) scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 0.3272
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: 207Pb_206Pb_Ratio
Attribute_Definition:

Ratio 207Pb/206Pb, or lead isotope 207 divided by lead isotope 206 for concordant (c) scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 0.40939
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: 207Pb_206Pb_Unc
Attribute_Definition:

Value is 2-sigma uncertainty of the ratio 207Pb/206Pb for concordant (c) scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 0.21205
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: Error_Correlation
Attribute_Definition:

Values are error correlation of 2-sigma uncertainty on 206Pb/238U and 207Pb/206Pb ratios.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -0.02506201
Range_Domain_Maximum: 0.85
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: 207Pb_235Uc_Age
Attribute_Definition:

Age in millions of years (Ma) calculated from the ratio of 207Pb/235U for concordant (c) scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 3565.85
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: 207Pb_235Uc_Age_Unc_Minus
Attribute_Definition:

Value is 2-sigma uncertainty in millions of years (Ma) lesser than the age calculated from the ratio of 207Pb/235U for concordant (c) scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 1841.19
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: 207Pb_235Uc_Age_Unc_Plus
Attribute_Definition:

Value is 2-sigma uncertainty in millions of years (Ma) greater than the age calculated from the ratio of 207Pb/235U for concordant (c) scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 949.54
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: 206Pb_238U_Age
Attribute_Definition:

Age in millions of years (Ma) calculated from the ratio of 206Pb/238U for concordant (c) scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 2964.86
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: 206Pb_238U_Age_Unc_Minus
Attribute_Definition:

Value is 2-sigma uncertainty in millions of years (Ma) lesser than the age calculated from the ratio of 206Pb/238U for concordant (c) scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 1413.12
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: 206Pb_238U_Age_Unc_Plus
Attribute_Definition:

Value is 2-sigma uncertainty in millions of years (Ma) greater than the age calculated from the ratio of 206Pb/238U for concordant (c) scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 1273.42
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: 207Pb_206Pb_Age
Attribute_Definition:

Age in millions of years (Ma) calculated from the ratio of 207Pb/206Pb for concordant (c) scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 3743.93
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: 207Pb_206Pb_Age_Unc_Minus
Attribute_Definition:

Value is 2-sigma uncertainty in millions of years (Ma) lesser than the age calculated from the ratio of 207Pb/206Pb for concordant scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 3958.54
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: 207Pb_206Pb_Age_Unc_Plus
Attribute_Definition:

Value is 2-sigma uncertainty in millions of years (Ma) greater than the age calculated from the ratio of 207Pb/206Pb for concordant (c) scans.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 2864.22
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: Preferred_Age
Attribute_Definition:

Preferred age in millions of years (Ma) selected from one of the three following fields containing calculated ages for each scan: 207Pb_235Uc_Age, 206Pb_238Uc_Age, or 207Pb/206Pbc_Age. Zero values indicate an analysis that failed to yield an age. This may occur when the concentration of uranium (U) in a zircon or detrital zircon is zero parts per million (ppm). In such cases, U is not available to decay to lead (Pb). Additionally, mathematically you cannot divide by zero.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 3800.65
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: Preferred_Age_Unc_Minus
Attribute_Definition:

Value is 2-sigma uncertainty in millions of years (Ma) lesser than the preferred age. Zero values indicate an analysis that failed to yield an age. This may occur when the concentration of uranium (U) in a zircon or detrital zircon is zero parts per million (ppm). In such cases, U is not available to lead (Pb). Additionally, mathematically you cannot divide by zero.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 1841.19
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: Preferred_Age_Unc_Plus
Attribute_Definition:

Value is 2-sigma uncertainty in millions of years (Ma) greater than the preferred age. Zero value indicates an analysis that failed to yield an age. This may occur when the concentration of uranium (U) in a zircon or detrital zircon is zero parts per million (ppm). In such cases, U is not available to decay to lead (Pb). Additionally, mathematically you cannot divide by zero.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 949.54
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: Preferred_Age_Type
Attribute_Definition:

Method used to calculate the values in field Preferred_Age for each individual analysis that yielded a valid result. The analyses that did not yield valid ages are listed as 'failed'. Refer to the description of analytical methods provided in the supplemental materials for more details.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 206Pb/238U concordant scans
Enumerated_Domain_Value_Definition:

If the number of concordant data scans for a spot was greater than zero, then 206Pb/238U age chosen because it exhibited a lower relative error

Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 207Pb/206Pb concordant scans
Enumerated_Domain_Value_Definition:

If the number of concordant data scans for a spot was greater than zero, then 207Pb/206Pb age chosen because it exhibited a lower relative error

Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 207Pb/235Uc_concordant scans
Enumerated_Domain_Value_Definition:

If the number of concordant data scans for a spot was greater than zero, then 207Pb/U235c age chosen because it exhibited a lower relative error

Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: failed
Enumerated_Domain_Value_Definition: The analysis failed to yield an age
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Pbc-corrected isotopic sums
Enumerated_Domain_Value_Definition:

If zero concordant data scans were observed, then the common Pb-corrected age based on isotopic sums of all acceptable scans is used

Enumerated_Domain_Value_Definition_Source: Author defined

Attribute:

Attribute_Label: Preferred_Age_Concordant_Scans
Attribute_Definition:

Total number of concordant scans obtained for each individual analysis.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 178

Attribute:

Attribute_Label: Preferred_Age_Total_Scans
Attribute_Definition: Total number of scans measured for each individual analysis.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 179

Detailed_Description:

Entity_Type:

Entity_Type_Label: geology_geochronologySummary_FarewellTerrane_dumoulin_2018
Entity_Type_Definition:

Table with sample information, including positional and descriptive locations, and rock description. The table is presented in comma separated value (CSV) format.

Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: SAMPLE
Attribute_Definition:

Sample field id assigned by USGS collector. Same as field USGS_Sample_Number in table Geology_geochronologyData_FarewellTerrane_dumoulin_2018.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Unique identifier for a sample

Attribute:

Attribute_Label: LAB_SAMPLE
Attribute_Definition:

Laboratory id assigned by Apatite to Zircon, Inc. Same as field A2Z_Sample_NUMBER in table Geology_geochronologySummary_FarewellTerrane_dumoulin_2018.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Unique identifier assigned by the laboratory

Attribute:

Attribute_Label: LATITUDE
Attribute_Definition: Latitude given in decimal degrees; datum NAD83
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 61.8996
Range_Domain_Maximum: 65.621
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: LONGITUDE
Attribute_Definition: Longitude given in decimal degrees; datum NAD83
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -167.6417
Range_Domain_Maximum: -147.3563
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: QUADRANGLE
Attribute_Definition:

Name of 1:63,360 scale U.S. Geological Survey Topographic quadrangle

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Name of USGS standard topographic map

Attribute:

Attribute_Label: UNIT_NAME
Attribute_Definition: Name of geologic unit the sample was collected from.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Name of geologic unit the sample was collected from.

Attribute:

Attribute_Label: ANALYSIS_TYPE
Attribute_Definition: Type of geochronologic analysis
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: UPb detrital zircon
Enumerated_Domain_Value_Definition:

Laser ablation-inductively coupled plasma-mass spectrometry on detrital zircons

Enumerated_Domain_Value_Definition_Source: Author defined

Attribute:

Attribute_Label: ROCK_CLASS
Attribute_Definition: Basic rock classification
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: sedimentary rock type

Attribute:

Attribute_Label: DESCRIPTION
Attribute_Definition: Brief description of the rock sample
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: rock sample description

Attribute:

Attribute_Label: COMMENTS
Attribute_Definition:

Additional comments about the sample or sample area. Null fields are present.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Additional descriptive information about the sample or sample area.

Detailed_Description:

Entity_Type:

Entity_Type_Label: geology_fossilData_FarewellTerrane_dumoulin_2018
Entity_Type_Definition:

Table of fossil and age identification and sample information. Includes information about the geologic formation that the sample was collected from, the fossil type that was identified, the fossil analyst and date of analysis, the rock type containing the fossil(s), all fossil species that were identified in the sample, and the corresponding geologic age of the fossil species. The table is presented in comma separated value (CSV) format.

Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: SAMPLE
Attribute_Definition: Sample field identification
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Sample field number, following this basic form. The attribute is a concatenation of the year the sample was collected, followed by letters identifying the collector (SB = Steve Box), followed by a number.

Attribute:

Attribute_Label: LATITUDE
Attribute_Definition: Latitude given in decimal degrees; datum NAD83
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 62.1536
Range_Domain_Maximum: 62.1536
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: LONGITUDE
Attribute_Definition: Longitude given in decimal degrees; datum NAD83
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -153.5643
Range_Domain_Maximum: -153.5643
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: QUADRANGLE
Attribute_Definition:

Name of the 1:63,360 scale U.S. Geological Survey Topographic quadrangle

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Name of USGS standard topographic map

Attribute:

Attribute_Label: UNIT_NAME
Attribute_Definition: Name of geologic unit the sample was collected from
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Name of geologic unit

Attribute:

Attribute_Label: FOSSIL_TYPE
Attribute_Definition: Type of fossils identified
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: fossil types

Attribute:

Attribute_Label: FOSSIL_ANALYST
Attribute_Definition:

Name and affiliation of paleontology expert who performed the fossil identification.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Name of paleontologist and affiliation

Attribute:

Attribute_Label: ANALYSIS_DATE
Attribute_Definition: Year when fossil was identified
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Calendar date in yyyy format

Attribute:

Attribute_Label: ROCK_CLASS
Attribute_Definition: Type of rock containing the fossil
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: rock type

Attribute:

Attribute_Label: DESCRIPTION
Attribute_Definition: Description of the rock sample
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: rock description

Attribute:

Attribute_Label: FOSSIL_ID
Attribute_Definition:

Faunal list of fossils found in rock sample; '?' denotes uncertainty.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: fossil names

Attribute:

Attribute_Label: FOSSIL_AGE
Attribute_Definition: Age of fossils on geologic time scale.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Age in geologic time

U-Pb Isotopic Data and Ages of Detrital Zircon Grains and Graptolite Fossil Data from Selected Rocks from the Western Alaska Range, Livengood area, and Seward Peninsula, Alaska - 2018

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