Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Averages, per period, of the percentage of SGG relative to the total grasses at each site. Dates are median dates for each period [A, UP; B, Natufian; C, Prepottery Neolithic A (PPNA); D, Early PPNB; E, Middle PPNB; F, Late PPNB]. The graph shows a decline in SGG from the UP to the Early PPNA and their negligible significance thereafter.
