ABotIsotopes
Archaeobotanical Isotope table: Isotopic values of specific archaeolbotanical plant remains. Typically these are done on a small aggregation of several seeds or samples, so all values are a mean estimate, and the sample size is important to estimate the accuracy and precision of this mean estimate. In contrast, some primary sources instead provide the standard deviations of these values, which is arguably even more important.
Column name	Data type	Column description
ABotIsoID	varchar	Primary key
PhaseID	varchar	Please see the detailed description of the 'Phases' table.
SampleID	varchar	The sample code used in the primary source literature for each plant/s part/s that have isotope values
TaxonCode	varchar	Code to identify the species, drawn from the zoptions_TaxaList
anatomy	varchar	Anatomical component of the plant, look up from zoptions_AbotAnatomy.
preservation	varchar	Description of type of preservation, e.g., charring, waterlogging, mineralisation, impressions, etc.
preservation_score	varchar	Preservation score of grains following Hubbard and al-Azm 1990, JAS 17.
number_of_samples	int	Typically isotope measurements are done bulk of several seeds or samples.
sample_notes	varchar
δ13C(‰)	decimal	Calibrated using the Vienna PeeDee Belemnite (VPDB) convention.
δ13C_corrected(‰)	decimal	Corrected for charring offset, which is the shift in the original plant carbon isotope composition, due to carbonisation.
δ15N(‰)	decimal	Absolute Isotope Ratio (AIR) convention.
δ15N_corrected(‰)	decimal	Corrected for charring offset, which is the shift in the original plant carbon isotope composition, due to carbonisation.
Δ13C_difference(‰)	decimal	The published difference between δ13C of the sample, and δ13C of independently estimated atmospheric δ13C from carbon dioxide.
C(%)	decimal	Percentage Carbon
N(%)	decimal	Percentage Nitrogen
C/N	decimal	Carbon:Nitrogen atomic ratio calculated using %C from the d13 C measurement and %N from the d15 N measurement. A lack of correlation between the two suggests that the original isotopic composition was not altered through diagenesis.
MassSpecType	varchar	Type of mass spectrometer
Mean_87Sr/86Sr	decimal	Ratio of 87Sr to 86Srrrt
Error_87Sr/86Sr	decimal	Measurement error of 87Sr to 86Sr
ppm	smallint
CitationID	varchar