tag:blogger.com,1999:blog-11787852.post-88339939324489987282008-02-07T17:00:00.000-08:002008-02-07T17:00:00.000-08:00The logical answer would be linked the earlier note about them possibly being on a trade route, they were probably used to collect rainwater so it would help travelers or some sort of message courier with water so they didn't have to run off path as much trying to find water.pwlnoreply@blogger.com