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Then as more sediment is deposited on top of the clay layer or bed, the water between the clay particles begins to be squeezed out and the clay minerals begin to all lay flat or horizontal.
When they are first deposited, they lay at all angles from horizontal to vertical (standing on edge).
However, the assumption of contemporaneity may not always be correct.
This is due to the fact that one or both of the objects may have been moved or redeposited into a different location.
However, relative methods are , which is that if there are layers of deposits, those laid down first will be on the bottom and those laid down last will be on the top. However, geological strata are not always found to be in a neat chronological order.