Angular unconformity, the lower deformed unit is upper Carboniferous in age (the Brejeira Formation) and the overlying undeformed unit is Triassic (the new red sandstones of the Grés de Silves Formation).
Moqui Marbles, naturally occurring iron oxide concretions that arise from navajo sandstone. Very prevalent in the Escalante Grand Staircase National Monument (I have a small one of these that looks like iron balls formed together!
The Great Unconformity, an angular unconformity, in the eastern Grand Canyon. The younger Cambrian Tapeats Sandstone rests unconformably on the older faulted and tilted sedimentary Grand Canyon Supergroup