Beer can dating
“ tabs came into existence in 1965 — and meet the minimum age threshold now! “They were typically teardrop in shape, with some having rounded distal margins, others squarish … The early models had solid aluminum tabs, no hole, no ring.
That distinguishes them right away.” The ring-tab design began to be phased out in 1975, after injuries were caused by people swallowing the metal tabs.
So, theoretically, the pull tabs may be the only way to place a temporal frame around the site, as none of the features will reveal specific enough age or date range.
“This is useful.” Schroeder stresses that the mere presence of 50-year-old ring tabs doesn’t automatically endow a site with protected status.
And in some states, the age threshold for historic significance can range from 45 to 75 years.
But the 50th anniversary of the ring-tab is just the latest reminder that once-forgotten bits of material culture are constantly taking on new meaning as they age, a process that archaeologists need to heed.
“The site may well be eligible to the National Register of Historic Places as a Traditional Cultural Property,” Schroeder said.
Barley will only grow at high or low latitudes because it requires seasonal rainfall patterns.’, just like they would if they found three pieces of cryptocrystalline silicate debitage [bits of stone used for making tools] on the surface,” Schroeder added.“I look forward to that day.” Schroder shared his research, and his key cards, earlier this month at the Northwest Anthropological Conference in Eugene, Oregon.It was replaced with a new modification called the Sta Tab, which used a flange of aluminum on the lid as a lever to press down on the sealed opening, a design that’s still in use today.These small changes in design can make a big difference, Schroeder noted, because the ring-tab’s new status means it can be used to identify sites that may have historic value.