Analysis of the flint tools from the Ice Age camp of Willendorf, along with a detailed lithic provenancing examination showed that up to one third of the blades that are typical of the Gravettian culture were made from what is known as northern flint. This raw material was never available on the Danube, but must have been brought from the northern moraines region to Willendorf. The long narrow blades from this high-quality flint are exceptional, however, it is what is not present that opens up a window onto its origins and the movement of the people themselves. The Willendorf site contains no suitable cores to makes these blades, which can only suggest that they were already complete when they arrived at the Danube and the cores were left at the site of extraction and production far to the north.