Glacial Lakes around Lesser Slave Lake

Where we find archaeological sites in the province is often strongly tied to the physical environment. We look for the different physical characteristics such as distance to water and if an area is high and dry. These features are indicators, which tell us that there could be an archaeological site in the area. This approach to finding archaeological sites is useful, but there are problems when we start considering how the landscape might change over time. The top of a hill set really far from a stream today, might have been beach front property in the past.

This is important in regards to our work on the shores of Lesser Slave Lake in Alberta. The Lesser Slave Lake basin has undergone extensive changes over the past 13,000 years, largely due to the retreating front of the glacial ice sheets at the end of the last ice age, and the incision and creation of the modern river valleys. Understanding how this environment changed over time is useful for identifying new archaeological sites in the region, as it helps us to understand how First Nations used the landscape in the past. Older archaeological sites may be on ancient beaches and meltwater channels that don’t look like they would be suitable for a campsite today, but were actually prime real estate 10, 000 years ago. These sites could be missed during an archaeological review and survey based on the modern landscape, so it is important that we understand how an area has changed, so that we can better predict where archaeological sites are going to be.

Continue reading “Glacial Lakes around Lesser Slave Lake”

Radial Biface

Today’s picture comes from the Ahai Mneh site on the shores of Lake Wabamun, west of Edmonton, AB. This archaeological site has a long history of human occupation, from earliest hints of people in Alberta using Clovis technology, right up to the Late Precontact and Historic Periods. Featured here is a large radial biface, made of a fine-grained siltstone. This artifact was found in a field adjacent to the site, having been turned up by a plow. While not exclusive, radial bifaces such as this one are commonly associated with the Clovis tool kit, dating back to 13 000 years ago in Alberta.

Relict Shoreline Identification using Lidar in the Lesser Slave Lake Region

I’ve submitted a poster for the upcoming CAA conference in Whitehorse, Yukon in May. Check out my abstract and check back for research updates on our blog!

Advances in remote sensing technologies and industry-driven initiatives have precipitated the wide scale production of lidar-derived digital elevation datasets in Alberta. These high-precision terrain models have been instrumental for cultural resource management strategies and the identification of new archaeological sites in the province. Lidar has proven to be extremely useful in targeting of distinct landforms and topographic features present on the landscape, and in the development of archaeological predictive models. While most lidar analyses for archaeological site predictions are focused on the modern landscape, these datasets can also be used to identify ancient landforms that may have been more suitable for human habitation in the distant past. Review of lidar data from the Lesser Slave Lake region in northern Alberta revealed numerous strandlines, meltwater channels, and relict beaches related to changing levels of proglacial lakes in the lake basin. These previously unmapped topographic features reveal a fluctuating landscape during the early period of human occupation in the province, and provide an opportunity to identify potential locations of ancient sites around the Lesser Slave Lake basin. A combination of reconstructions of proglacial lake levels using strandline elevations and current predictive modeling techniques was used to identify locations reflective of this past landscape with high archaeological potential for sites. This information will be used to direct future surveys in the region, to identify archaeological sites that might otherwise have been missed by cultural resource management programs.