you mentioned a kind of reduction in you answer, what is that?
It is the process of fashioning stones or rocks from their natural state into tools or weapons by removing some parts.
Lithic reduction
In archaeology, in particular of the Stone Age, lithic reduction is the process of fashioning stones or rocks from their natural state into tools or weapons by removing some parts.
what is referred as bull run river? It is a tributary of the Sandy River. where is it situated? U.S. state of Oregon who were its first inhabitants? Paleo-Indians how is the climate here? mild climate is it related to any energy producing project? UNANSWERABLE how is the above mentioned group of people classified? They  are generally classified by lithic reduction or lithic core "styles" and by regional adaptations. when did they migrate to america? 17,000 years ago
wiki:1155878
Lithic reduction [SEP] Introduction
In archaeology, in particular of the Stone Age, lithic reduction is the process of fashioning stones or rocks from their natural state into tools or weapons by removing some parts. It has been intensely studied and many archaeological industries are identified almost entirely by the lithic analysis of the precise style of their tools and the chaîne opératoire of the reduction techniques they used. Normally the starting point is the selection of a piece of tool stone that has been detached by natural geological processes, and is an appropriate size and shape. In some cases solid rock or larger boulders may be quarried and broken into suitable smaller pieces, and in others the starting point may be a piece of the debitage, a flake removed from a previous operation to make a larger tool.