The authors define a readily distinguished type of small, triangular, side-rotched projectile point previously assigned to the Late Prehistoric Period of the northwestern Plains but which was thought too generalized to be used in studies of cultural and ethnic affiliation. Type sites are described, geographical distributions made, and factors considered which may have influenced the development of this point type in southwestern Saskatchewan. It is concluded that the Avonlea point is sufficiently unique and temporally delimited to serve as a useful marker for the early Late Prehistoric Period in the northwestern Plains.