Despite considerable cultural continuity, life was not without significant changes. Some 10-12,000 years ago, Tasmania became isolated from the mainland, and some stone technologies failed to reach the Tasmanian people (such as the hafting of stone tools and the use of the Boomerang). The land was not always kind; Aboriginal people of southeastern Australia endured more than a dozen volcanic eruptions...(including) Mount Gambier, a mere 1,400 years ago. In southeastern Australia, near present-day Lake Condah, semi-permanent villages of beehive shaped shelters of stone developed, near bountiful food supplies.