From 2014 to 2020, we compiled radiocarbon ages from the lower 48 states, creating a database of more than 100,000 archaeological, geological, and paleontological ages that will be freely available to researchers through the Canadian Archaeological Radiocarbon Database. Here, we discuss the process used to compile ages, general characteristics of the database, and lessons learned from this exercise in “big data” compilation.

In this paper we use radiocarbon dates to evaluate the signature of the Younger Dryas Chronozone (YDC) in eastern North America. Using an approach that examines radiocarbon dates by region, we argue that the northeastern United States shows a better overall representation of radiocarbon dates when compared to the Mid-Atlantic and Southeast. These data result in a peak in summed probability distributions during the YDC, which is often interpreted as evidence of population growth. Further examination of these distributions, however, illustrates that differential standard deviations, varying sample size, and the effect of taphonomic and research biases likely overwhelm any demographic signatures in our study sample. Consequently, the frequency of radiocarbon dates by itself is insufficient for understanding the relationship between climate, culture and demography in eastern North America.

The Shawnee-Minisink site is well known for yielding fish and plant remains from Clovis contexts. New investigations at Shawnee-Minisink have provided a sample of macrobotanical remains for comparison with the ten plant species previously recovered at the site. In this paper, I reevaluate the subsistence remains recovered during the 1970s excavations by American University and conclude that a limited number of plants were actually exploited by the site's occupants. The new macrobotantical remains from Shawnee-Minisink have provided a series of AMS dates, which offer the most precise age estimate for Clovis in the Northeast and provide an alternative interpretation concerning the role plants played in the subsistence practices of early Paleoindians. The subsistence evidence from Shawnee-Minisink shows variation in diet, but a difference that should be expected at large habitation sites.