> .. and extracted rock crystal from the vein, after which it was covered by the advancing glacier. I think you read wrong. It says it was covered by the advan

> .. and extracted rock crystal from the vein, after which it was covered by the advancing glacier. I think you read wrong. It says it was covered by the advancing glacier, not uncovered. So at 5900 BC the glacier had advanced less than now and certainly a lot less than say 100 years ago. Doesn't this mean that it was warmer at that time, or at the very least, warmer some time not too long before 5900 BC?