A lot of Cobs have been found in Illinois and Missouri....A guy who knew,I liked artifacts showed me his frame the cobbs was in the middle surrounded by a weathered drill,heartbreaker blade,scraper and about 8 natural rocks. He called the cobbs an adena. I told him I thought is was Cobb,but would ask the guys on the artifact forum board for him. He found it in a field in Calhoun county Illinois. Thanks for opinions guys.
Well in some states they call them preforms so it depends on where it was found.