ABSTRACT
Many sediments can be referred to as sandstones, shales, or limestones, but others are mixtures between those and other sedimentary end members. Siltstones, for example, generally have compositions between typical sandstone and shale, and marls have compositions between shale and limestone. Where metamorphosed, these rocks develop mineralogy and appearance that can be quite different from the metamorphosed end members. This has been discussed to some degree in Chapters 4 and 5 regarding marbles and some calc-silicate rocks. This chapter illustrates such sedimentary mixtures as they occur in metamorphosed stratigraphic sequences.
