Studying sediment deposits in Lake Chalain gives us a good idea of the general climate history.
By showing variations in the level of the lake, these deposits show the various rainy periods that occurred during Neolithic. We can thus see the changes in the weather than the Chalain and Clairvaux inhabitants endured.
By comparing these climatic changes with other data, it is possible to find correlations that act as clues to the Neolithic population variations of the two areas—to the point where we have a nearly complete historical record!