Entity_Type:
Entity_Type_Label: Olowalu_coral_chronology.csv
Entity_Type_Definition:
Table containing results of age dating based on uranium-thorium and radiocarbon methods.
Entity_Type_Definition_Source: Producer defined
Attribute:
Attribute_Label: Cumulative Distance
Attribute_Definition:
Cumulative distance from the top of the core to the bottom of the core.
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 23
Range_Domain_Maximum: 297
Attribute_Units_of_Measure: millimeter
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: 238U
Attribute_Definition:
Concentration of Uranium-238 isotope in sample in parts per billion (ppb). Empty cells in the spreadsheet are common, as Uranium-238 concentration was not calculated for every sample.
Attribute_Definition_Source: standard value in analytical chemistry
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2256
Range_Domain_Maximum: 2519
Attribute_Units_of_Measure: parts per billion (ppb)
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: 238U (error)
Attribute_Definition:
Concentration of Uranium-238 isotope error in sample in parts per billion (ppb) reported as 2-sigma composition. Empty cells in the spreadsheet are common, as Uranium-238 error was not calculated for every sample.
Attribute_Definition_Source: standard value in analytical chemistry
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3
Range_Domain_Maximum: 5
Attribute_Units_of_Measure: parts per billion (ppb)
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: 232Th
Attribute_Definition:
Concentration of Thorium-232 isotope in sample in parts per trillion (ppt). Empty cells in the spreadsheet are common, as Thorium-232 concentration was not calculated for every sample.
Attribute_Definition_Source: standard value in analytical chemistry
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 59
Range_Domain_Maximum: 1592
Attribute_Units_of_Measure: parts per trillion (ppt)
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: 232Th (error)
Attribute_Definition:
Concentration of Thorium-232 isotope error in sample in parts per billion (ppb) reported as 2-sigma composition. Empty cells in the spreadsheet are common, as Thorium-232 error was not calculated for every sample.
Attribute_Definition_Source: standard value in analytical chemistry
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2
Range_Domain_Maximum: 32
Attribute_Units_of_Measure: parts per trillion (ppt)
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: 230Th:232Th (atomic ratio)
Attribute_Definition:
Thorium-230:Thorium-232 atomic ratio x 10-6. Empty cells in the spreadsheet are common, as 230Th:232Th was not calculated for every sample.
Attribute_Definition_Source: defined in Jaffey and others, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 20
Range_Domain_Maximum: 1628
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: 230Th:232Th atomic ratio (error)
Attribute_Definition:
Thorium-230:Thorium-232 atomic ratio error x10-6 reported as 2-sigma composition. Empty cells in the spreadsheet are common, as 230Th:232Th error was not calculated for every sample.
Attribute_Definition_Source: defined in Jaffey and others, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 74
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: delta-U-234 (measured)
Attribute_Definition:
A measure of the ratio of Uranium-234:Uranium-238, reported in parts per thousand (per mil). Empty cells in the spreadsheet are common, as 234U:238U was not calculated for every sample.
Attribute_Definition_Source: defined in Jaffey and others, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 144.9
Range_Domain_Maximum: 146.6
Attribute_Units_of_Measure: parts per thousand (per mil)
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: delta-U-234 (measured, error)
Attribute_Definition:
A measure of the ratio of Uranium-234:Uranium-238 error, reported in parts per thousand (per mil) . Empty cells in the spreadsheet are common, as 234U:238U error was not calculated for every sample.
Attribute_Definition_Source: defined in Jaffey and others, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.2
Range_Domain_Maximum: 1.6
Attribute_Units_of_Measure: parts per thousand (per mil)
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: 230Th:238U AR
Attribute_Definition:
Thorium-230:Uranium-238 Activity Ratio. Empty cells in the spreadsheet are common, as 230Th:238U AR was not calculated for every sample.
Attribute_Definition_Source: defined in Jaffey and others, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0007
Range_Domain_Maximum: 0.0024
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: 230Th:238U AR (error)
Attribute_Definition:
Thorium-230:Uranium-238 Activity Ratio error reported as 2-sigma composition. Empty cells in the spreadsheet are common, as 230Th:238U AR (error) was not calculated for every sample.
Attribute_Definition_Source: defined in Jaffey and others, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0000
Range_Domain_Maximum: 0.0001
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: 230Th age (uncorrected) (yr)
Attribute_Definition:
Uncorrected Thorium-230 age (yr). Empty cells in the spreadsheet are common, as Thorium-230 age was not calculated for every sample.
Attribute_Definition_Source: defined in Jaffey and others, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 64
Range_Domain_Maximum: 232
Attribute_Units_of_Measure: year
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: 230Th age error (uncorrected, yr)
Attribute_Definition:
Uncorrected Thorium-230 age (yr) error reported as 2-sigma composition. Empty cells in the spreadsheet are common, as Thorium-230 age was not calculated for every sample.
Attribute_Definition_Source: defined in Jaffey and others, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4
Range_Domain_Maximum: 7
Attribute_Units_of_Measure: year
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: 230Th age (corrected, yr)
Attribute_Definition:
Corrected Thorium-230 age (yr). Corrected 230Th ages assume the initial 230Th:232Th atomic ratio of 4.4 ±2.2 x10-6. Those are the values for a material at secular equilibrium, with the bulk earth 232Th:238U value of 3.8. The errors are arbitrarily assumed to be 50 percent. Empty cells in the spreadsheet are common, as Thorium-230 age was not calculated for every sample.
Attribute_Definition_Source: defined in Jaffey and others, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 50
Range_Domain_Maximum: 231
Attribute_Units_of_Measure: year
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: 230Th age error (corrected) (yr)
Attribute_Definition:
Corrected Thorium-230 age erro (yr) reported as 2-sigma composition. Empty cells in the spreadsheet are common, as Thorium-230 age error was not calculated for every sample.
Attribute_Definition_Source: defined in Jaffey and others, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4
Range_Domain_Maximum: 14
Attribute_Units_of_Measure: year
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: delta-U-234 initial (corrected)
Attribute_Definition:
A measure of the initial ratio of Uranium-234:Uranium-238, reported in parts per thousand (per mil). Empty cells in the spreadsheet are common, as 234U:238U was not calculated for every sample.
Attribute_Definition_Source: defined in Jaffey and others, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 145
Range_Domain_Maximum: 147
Attribute_Units_of_Measure: parts per thousand (per mil)
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: delta-U-234 initial error (corrected)
Attribute_Definition:
A measure of the initial ratio of Uranium-234:Uranium-238 error, reported in parts per thousand (per mil). Empty cells in the spreadsheet are common, as 234U:238U initial error was not calculated for every sample.
Attribute_Definition_Source: defined in Jaffey and others, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 2
Attribute_Units_of_Measure: parts per thousand (per mil)
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: 230Th age (corrected, yr BP)
Attribute_Definition:
Corrected Thorium-230 age (yr BP). BP stands for “Before Present” where the “Present” is defined as the year 1950 A.D. Empty cells in the spreadsheet are common, as Thorium-230 age was not calculated for every sample.
Attribute_Definition_Source: defined in Jaffey and others, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -14
Range_Domain_Maximum: 167
Attribute_Units_of_Measure: yr BP
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: 230Th age error (corrected, yr BP)
Attribute_Definition:
Corrected Thorium-230 age (yr BP) error. BP stands for “Before Present” where the “Present” is defined as the year 1950 A.D. Empty cells in the spreadsheet are common, as Thorium-230 age error was not calculated for every sample.
Attribute_Definition_Source: defined in Jaffey and others, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4
Range_Domain_Maximum: 14
Attribute_Units_of_Measure: yr BP
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: Assigned date
Attribute_Definition:
Assigned calendar date based on 230Th age and yr BP defined as 1950 A.D. Empty cells in the spreadsheet are common, as assigned date was not calculated for every sample.
Attribute_Definition_Source: produced defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1783
Range_Domain_Maximum: 1964
Attribute_Units_of_Measure: yr A.D.
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: Fraction Modern
Attribute_Definition:
Fraction Modern is a measurement of the deviation of the carbon-14:carbon-12 ratio of a sample from "Modern." Modern is defined as 95 percent of the radiocarbon concentration (in AD 1950) of NBS Oxalic Acid I (SRM 4990B, OX-I) normalized to delta-C-13 =-19 per mil (Olsson, 1970). Empty cells in the spreadsheet are common, as Fraction Modern was not calculated for every sample.
Attribute_Definition_Source: defined in Stuiver and Polach, 1977
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.9490
Range_Domain_Maximum: 1.1480
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: Fraction Modern error
Attribute_Definition:
Fraction Modern error is a measurement error of the deviation of the carbon-14:carbon-12 ratio of a sample from "Modern." Modern is defined as 95 percent of the radiocarbon concentration (in AD 1950) of NBS Oxalic Acid I (SRM 4990B, OX-I) normalized to delta-C-13 =-19 per mil (Olsson, 1970). Empty cells in the spreadsheet are common, as Fraction Modern error was not calculated for every sample.
Attribute_Definition_Source: defined in Stuiver and Polach, 1977
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0030
Range_Domain_Maximum: 0.0041
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: Delta-C-14
Attribute_Definition:
The relative difference between the absolute international standard (base year 1950) and sample activity corrected for age and delta-Carbon-13. Empty cells in the spreadsheet are common, as Delta-Carbon-14 was not calculated for every sample.
Attribute_Definition_Source: defined in Stuiver and Polach, 1977
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -51
Range_Domain_Maximum: 148
Attribute_Units_of_Measure: parts per thousand (per mil)
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: Delta-C-14 error
Attribute_Definition:
The error for the relative difference between the absolute international standard (base year 1950) and sample activity corrected for age and delta-Carbon-13. Empty cells in the spreadsheet are common, as Delta-Carbon-14 error was not calculated for every sample.
Attribute_Definition_Source: defined in Stuiver and Polach, 1977
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3
Range_Domain_Maximum: 4.1
Attribute_Units_of_Measure: parts per thousand (per mil)
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: Delta-C-14 age (yr BP)
Attribute_Definition:
Radiocarbon age in year before present (yr BP) with present defined as 1950. Empty cells in the spreadsheet are common, as radiocarbon was not calculated for every sample.
Attribute_Definition_Source: defined in Stuiver and Polach, 1977
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 420
Range_Domain_Maximum: 420
Attribute_Units_of_Measure: year before present (yr BP)
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: Delta-C-14 age error (yr BP)
Attribute_Definition:
Radiocarbon age error in year before present (yr BP) with present defined as 1950. Empty cells in the spreadsheet are common, as radiocarbon age error was not calculated for every sample.
Attribute_Definition_Source: defined in Stuiver and Polach, 1977
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 30
Range_Domain_Maximum: 30
Attribute_Units_of_Measure: year before present (yr BP)
Attribute_Measurement_Resolution: 1