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.
Acheulean sites occur singly, in chronological series (as at Olduvai) and in paenecontemporaneous clusters (as at Olorgesailie). Even without chronological precision it is possible to compare variability within site complexes and variability between sites and site complexes.
