Clac·to·ni·an 
(klăk-tōnē-ən)
(klăk-tōnē-ən)adj.
Archaeology
Archaeology
Of or relating to an early Paleolithic tool culture of northwest Europe, characterized by simple core and flake tools. Traditionally considered to predate the Acheulian culture, it is now thought by some to be contemporaneous.
[After Clacton-on-Sea, a town in southeast England on the North Sea where artifacts from the culture were found.]