A Delineation of the Strata of England and Wales, with part of Scotland

A Delineation of the Strata of England and Wales, with part of Scotland was a groundbreaking geological map created by William Smith, published in 1815. This map is considered the first of its kind in modern geology and established the style for future geological maps.1

Smith, an English engineer and geologist, developed the science of stratigraphy by observing that different rock layers contained unique fossils. He used this principle of faunal succession to trace rock strata across England and Wales, even when exposures were limited. Many of the names Smith assigned to these rock layers are still in use today. His work revolutionized the understanding of geological formations and their relationships.12