I am sure it is mate, I have emailed the archeologist and will wait to hear from him on Monday. He will know, but you can tell straight away, its been shaped by hand, and used lots. He explained about the areas of clay that are exposed. The areas with millions of shells all smashed up is the old dump of the settlements. Next to this area you find black charcoal, he said that was from their fire pits. I found the hand axe stuck in the clay with loads of shells scattered for metres around. It was mid tide area. I've noticed these areas of shells, and I know where there are more areas, and right now there's a massive storm due to peak tomorrow.... It could expose even more! The guy had a map of exactly where the known settlements were. I will try and get a copy of that........