Orra White Hitchcock for use in Professor Edward Hitchcock’s classes on geology and natural history. (1828-1840) Pen and ink on linen.
(1.) Vein of Greenstone in Clay Slate, Charlestown, Mass. (2.) Trap Dike in Sandstone, East Haven (3.) Slate, Devon, England (4.) Valleys (5.) Contortions in Clay Beds, Deerfield, Mass. (6.) Coal basin and Dike (7.)Kirkdale Cavern