(4) Make a series of sketches showing the changes in texture that occur with regional metamorphism of (a) slate, (b) sandstone, (c) conglomerate, and (d) marble. (5) Define foliation and explain the characteristics of (a) slaty cleavage, (b) schistosity, (c) gneissic layering, and(d) mylonitic texture. (8) Make a generalized flowchart showing the origin of the common metamorphic rocks..