Got out yesterday to my archaic site and it didnt disappoint.Found this woodworking tool,a quartz scraper and a first for me a bottom chunk of a pottery vessel...You can see the quartz in the clay..mjm
You see narrow bottomed vessels in a lot of places because they could easily place it in a fire. (Push the base into the coals, wedge it between logs, etc.) Or they could put it in sand/soil without it toppling over. You'll see some thickness and fire marks if it was made for heat.