Although associated human skeletal remains are limited to a couple of isolated teeth, we assume that modern humans made these artifacts, and this leads to the key conclusion of the paper--that modern humans appeared on the central East European Plain at least as early as they appeared in places like Bulgaria and Italy.
The presence of transitional assemblages in the form of those assigned to Strelets does not contradict or negate this conclusion. The Strelets assemblages represent a classic transitional industry that is dominated by Middle Paleolithic technology and tool types and devoid of elements exclusively associated with industries produced by modern humans (e.g., figurative art). But the makers of these assemblages, which are found both below and above the tephra at Kostenki, is not clear. As noted in the Science paper, they may represent an activity variant (e.g., kill-butchery tool kit and associated debris) and a prime example is found in Layer III of Kostenki 12, where the Strelets tools and few waste flakes are found with a mass of horse and reindeer bones. Recently, a similar assemblage was recovered in an early Upper Paleolithic context at Mamontovaya Kurya on the Arctic Circle in northern Russia. I doubt that Neandertals made the tools at Mamontovaya Kurya. Nevertheless, the problem of the Strelets assemblages remains unresolved; they may or may not represent a true analog of the Chatelperronian or Uluzzian in eastern Europe.
Chronological Frameworks
In his final comment, Hawks notes that the limitations of radiocarbon dating the Middle/Upper Paleolithic transition revealed at Kostenki have implications for other sites and regions. On this point, I fully concur. Sites and assemblages dating to the period of the transition cannot be dated by radiocarbon alone, because both transitional and non-transitional industries are present in Europe prior to 40,000 calendar years ago. The chronological framework must be based primarily on other methods, such as tephrochronology, paleomagnetic stratigraphy, and OSL-preferably as many as possible at any one location.John F. Hoffecker
Institute of Arctic and Alpine Research
University of Colorado at Boulder
16 January 2007


