Page:U.S. Government Printing Office Style Manual 2008.djvu/360

344 Physiographic regions are based on terrain texture, rock type, and geologic structure and history. The classification system has three tiers: divisions, which are broken into provinces, and some provinces break further into sections. All names are capitalized, not the class; for graphic see http://tapestry.usgs.gov/physiogr/physio.html.