Further testing of sediments is the right thing to do.

Studies of sediment suggest that it was once below sea level.

Wind also plays a part in the transportation of sediment.

However, centuries worth of sediment that had covered them was gone.

The site has over 28 feet of sediment that contain artifacts.

Except for the top 1,033 feet of sediment, the entire structure was volcanic.

It is the sticking together of sediment that forms a rock.

But the site has about sixty five million years worth of sediment covering it.

The thickness could, therefore, amount to several thousand feet of sediment.

Newer layers of sediment were added to the old ones.