Take the Self Test and check out the answers. No physical evidence for erosion or deformation. Beds deposited from the bottom up according to the Law of Superposition of Strata. In this sketch the break is evident in the erosional relief at the contact and by the clasts of older rocks in the younger strata. In some cases the surface is flat and there are no clasts but there could be subtle signs that weathering has occurred.
Some passage of time is needed for the uplift and erosion.
Additional time may be represented by any rocks that were once present but removed by the erosion. Click for animation . This indicates that deformation of the older beds occurred before the upper beds were deposited. In this sketch the deformation consists of tilting and faulting. Either could occur by itself or the beds could be folded.