2. Uplift and erosion of the shale, creating a land surface.

3. Deposition of coarse-grained sediments (such as gravel or cobbles) on the land surface by a high-energy event (such as a flood or debris flow).

4. Cementation of the coarse-grained sediments to form a conglomerate.

5. Subsidence of the land surface and renewed deposition of shale over the conglomerate.