Contact between the Upper Cretaceous Chatsworth Formation on the right and the Simi Conglomerate Member of the Santa Susana Formation on the left. Resistant beds of sandstone occur on both sides of the photo. The grassy area between the two resistant sandstone deposits are underlain by conglomerate. Thick deposits of conglomerate are not normally found in the Chatsworth Formation. So where would you place the contact between the two formations? See next photo.