Unconformity

In the sample rock formation from oldest to youn gest the layers are:D, A, E, B, and C. Letter D came first, as in it was the older. Then there was A, E, B, and the youngest would be C. I understand that C is the youngest because it on top of all the other layers. Also that D is the oldest because it is under all the rest if the layers. That's how I found out how old they all were. Seeing where they were in their layers. Since layer B is on top of all the rest, it is the second youngest. In the photo there are three types of unconformities: disconformity, angular unconformity, and nonconformity. The A layer has 2 nonconformities. The D layer has a noconformity and angular unconformity. The layer B has 2 disconformities.