Project generated identifier for features. Feature data was developed by attributing space to chronologically distinct concentrations of artifacts, as determined by performing an Anselin Lola Moran's I function to the observation point data and the chronologically diagnostic material collected at the survey unit level (and their derivative data). See Newhard (2013b), Bartholomew (2015) and Newhard et al. (2018). Additional fields preserve information related to determining potential functional use of these spaces. See Newhard et al. (2012), Newhard (2012a, b, c), Newhard, Levine, and Adams (2014, 2018).