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Reported contextual information on where the sample was obtained. This date is not always referenced in the database due to the fact that it may not have been referenced in the publication.The following abbreviations are used throughout database: Md. A C13/C12 correction factor, applied to the measured raw radiocarbon age, to adjust the date for fluctuation and variation in the carbon isotope ratios as a result of natural biochemical processes and non-natural causes, was not used until the late 1980s.Fields from the original database that have been maintained are material, provenience, measured radiocarbon age, C12/C13 (now headed as correction factor), conventional radiocarbon age (CRA) BP, Calibrated (Cal) median B. Fields added to the database are the LA report number, calibration reference (if known), and references (all known references on a date not just the primary reference).For ease of use and for those who may not be familiar with radiocarbon dating a brief description of each of these terms follows: Each archaeological site in Louisiana is assigned a unique number consisting of three parts.The conventional date is the raw/measured radiocarbon date that has been normalized to the modern standard through the use of C13/C12 correction factor.Always use this date and the associated correction factor when calibrating or recalibrating a date.It should be noted that calibrated dates using an estimated correction factor may result in an unreliable calibrated date.In some cases of earlier reported dates it is unknown whether the date provided was a conventional date or a measured radiocarbon date.
This is the reference for the calibrated dates presented in the table.
As new cultural resource management reports that contain radiocarbon dates are added to our library, the dates will be entered into the database.
In some cases, dates may be published in other venues such as newsletters, journals and dissertations that would not necessarily be sent to our office.
In rare cases, the dates may have never been published.
It is our hope that researches will share their radiocarbon dates with us via email.