- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
The banding of gneisses is due to spreading out, under pressure, of the sediments originally forming them. Mere static pressure resulting from deep burial produces no noticeable compaction of sediments. Spreading also leads to thickening of continental borders and preservation of continental masses.