That's a great question with a pretty simple answer; newer deposits are much newer, millions, sometimes billions of years newer than older deposits. That should seem obvious but perhaps it is not.
Newer deposits often come from eroding and weathering older deposits. The result when combined with living materials is what we call soil. It can also be sand or gravel and transported by gravity or wind or water.
It is a process though and continuing. We usually live on the topmost layer but digging a trench in soil will often yield evidence of when others lived on what was then the top most layer. We can with very high confidence examine evidence from the last 20-30,000 years and remain in the layer we call "soil".
The pattern, process, method though is pretty simple. High spots get worn down while low spots get filled up.
Fortunately though there are other forces going on all the time. Parts of the surface get pushed up, parts get sucked down, sometimes the molten core breaks through and adds a new island or mountain or lava bed. As pieces parts that are now "soil" get buried deeper and deeper the pressure and temperature will increase and the soil will take on new characteristics becoming rock instead of "soil". Even then change can continue with the very nature of the material changing yet again. A great example is the granite found in Yosemite which is among the hardest granite found anywhere.
But so far no one has ever presented a model, process or method for what is seen that does not require long, long, long periods of time.
Faith has never presented a model, method or process where the flood she claims happened (I'm not sure which of the mutually exclusive Biblical Floods she considers to be the right one) could do anything that is seen. The best she has presented has been that the flud picked up what is seen somewhere else and then moved it to where it is found now yet never explains how her flud could do such a thing or how the object could be created in the first place so it could be moved.
That the geologic column is growing and changing is more than adequately evidenced; I have to wash my car, when it rains I can see part of my yard being washed into the street.
So the answer to why the New depositions are strangely different from old strata is just "Time".
Anyone so limited that they can only spell a word one way is severely handicapped!