The process of creating stone tools through lithic reduction (by removing stone chips). A hammer (such as a stone or antler) is used to strike the core rock in order to remove smaller pieces. The core is either shaped into a specific tool, like a biface, or the flakes that have been taken off are used or shaped into something specific, like a projectile point.
Surface exposures are areas where there is no vegetation and the mineral soils are visible. These can occur naturally (areas of slumping, beaches, blow-out, or other natural erosional processes), or be caused by human activity (ATV trails, furrows created for site prep and skid trails just to name a few). Surface exposures can be great for covering a lot of ground during survey.
A biface is a stone tool that has flakes removed from both sides. It can be used as a knife, scraper, or further worked into a more recognizable tool. The typical biface shape is an oval with slightly pointed ends. The biface on the left was found near Fort Vermilion in 2016.
When bone is burnt by a fire it can undergo a range of changes in appearances, such as calcining. Calcining, characterized by its bright white colour, is caused when bone is burnt at a higher temperatures. The bone can shrink, become more white or chalky in appearance, more fragile and more likely to fragment into smaller pieces. These pieces of calcined bone were collected during the summer of 2017. Calcined bone indicates the presence of a hearth at the site.
A core is a larger piece of stone from which many smaller flakes are removed. These flakes are then turned into tools or are utilized as they are. There are many different types of cores, but a common way to describe them is by the direction(s) flakes were removed, or by the shape of the core. For example, unidirectional cores have flakes removed all in the same direction. That has had many stone flakes removed to make other tools.
Obsidian is commonly known as volcanic glass. It forms when a volcano erupts and the lava is cooled extremely quickly, such as when it flows into a water body. In Alberta obsidian is considered to be an “exotic material” because it does not occur here naturally. When we find it here it tells us that people in the past engaged in long distance trade, usually with people in British Columbia or the Yukon. In 2016 Teresa found this lovely obsidian flake at site FaPr-6 located near the community of Caroline.
Debitage, or flakes, are bits of stone chips that are left behind while making or modifying a stone tool. This artifact type has distinctive features that make them easily recognizable to archaeologists and clearly distinguish them from naturally occurring broken rocks.