The Geological Structure of the Globe: Johnston 1855

Title: The Geological Structure of the Globe Author: Johnston, W. & A.K. Date: 1855 Medium: Chromolithograph with some hand color Condition: Uniformly aged paper, extremely minor foxing, very minor stains  Inches: 24 1/4 x 20 [Image] Centimeters: 61.59 x 50.8 [Image] Product ID: 308052 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. A thematic map is one that portrays a geographic pattern of a certain subject matter that is not naturally visible like population, language, weather patterns. A key on the map delineates the six major categories identified by Ami Boué. At bottom one can glean the elevations of the worlds principal mountains and two inset maps depict "Directions of the Systems of Mountains as they appear at Milford” as well as “Illustrations of the Synchronism of Parallel Chains”. Also, the geography of the Nort