Have you been one of the followers who has been reading our blog for a while? I know lots of you are! Something you may not have noticed about our posts of what we find in Grid 51 is that as we get deeper, things are getting older. In science, the Law of Superposition tells us that older layers are at the bottom, while newer things are built on top (think of it like your laundry basket-what you wear on Monday is at the bottom, and what you wear on Friday is at the top). Right now in Grid 51, we are just starting to hit the Philistine period, but volunteers had to go through other layers first. Check out this timeline to see how periods in Ashkelon are built on each other, and you can even do this lesson to help you better understand how this vertical timeline was created.