I will never forget these extraordinary experiences that are a landmark in my personal and professional life. We received the following in response to our request for articles on native Minnesota knapping materials. The article is longer than our normal pieces but because it is so informative we will present it in its entirety through the next few issues. You will note that Dr. Romano confined his remarks to Northern Minnesota. In this grouping we must also mention Jaspilite, Recrystallized Rhyolite and Hudson's Bay Lowland Chert.
Some specimens appear to have more silica than others.
A peculiar greenish, glossy type occurs frequently in artifact collections from the Reservoir Lakes area north of Duluth. Various gradations of this material are far from being completely understood. Although many interested persons have voiced their opinion in identifying the method of formation of Knife Lake material, one very logical explanation has not been pursued as far as I know. It is found in sites over a wide spread area in Minnesota. It does not yield well to pressure flaking.