The Ordovician spans The Ordovician, named after the Welsh tribe of the Ordovices , was defined by Charles Lapworth in to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison , who were placing the same rock beds in northern Wales into the Cambrian and Silurian systems, respectively. The Ordovician received international approval in forty years after Lapworth's death , when it was adopted as an official period of the Paleozoic Era by the International Geological Congress. Life continued to flourish during the Ordovician as it did in the earlier Cambrian period, although the end of the period was marked by the Ordovician—Silurian extinction events.
Europe :. Items of personal adornment pierced and ochred Nassarius shell beads are known from at least one Aterian site, with an age of 82, years. The appropriateness of the term Mousterian is contested in a North African context, however. The technological character of the Aterian has been debated for almost a century,  but has until recently eluded definition. The problems defining the industry have related to its research history and the fact that a number of similarities have been observed between the Aterian and other North African stone tool industries of the same date. Bifacial foliates moreover represent a huge taxonomic category and the form and dimension of such foliates associated with tanged tools is extremely varied.