This large map, drawn on Mercator's Projection, is a superb example of thematic mapping with various colors and diagrams used to illustrate the geological distributions throughout the world. The geological types are fully colored (both hand and early printed color) and a key delineates the six major categories identified by Ami Boué. The first two categories are further divided through subtle differences in shading. There are two inset maps: "Directions of the Systems of Mountains as they appear at Milford by E. de Beaumon ," and "Illustrations of the Synchronism of Parallel Chains" with colored underlining to delineate seven different systems. Also, two hemispheres show the geology of the North and South poles. Along the bottom of the map is a full profile of the "Principle Mountains of the Globe." Surrounded by a decorative keyboard-style border, this handsome chart is from the English version of Heinrich Berghaus' Physikalischer Atlas, the first truly comprehensive thematic atlas. It is a very early example of printed color (with some hand color), the development of which made a huge impact on cartography in general and specifically on the graphic portrayal of geographical data on thematic maps. Plate I from this large atlas. Engraved by W. & A.K. Johnston in Edinburgh.

References: Marcou & Marcou #5; Phillips (A) #229.

Condition: A

On a sturdy clean sheet.