Depicting the earth beneath our feet, each of the stratigraphic illustrations-diagrams of rock strata hand drawn between the mid-1800s and 1980s-in this collection tells a geologic story exquisitely rendered in color palettes from muddy pastels to Milton Glaser-style bolds and evolving scientific graphic conventions. Created by the United States Geological Survey and often used by petroleum and mining companies, these documents are a vivid reminder of the stakes involved in current threats to natural resources. | A Slice Through America by David Kassel, Hardcover | Indigo Chapters