Excerpt from The American Journal of Science and Arts, Vol. 22: July, 1832
Art. I.- Report on the Geology of Massachusetts; examined under the direction of the Government of that State, during the years 1830 and 1831; by Edward Hitchcock, Prof, of Chemistry and Natural History in Amherst College.
Part l. - The Economical Geology of the State, with a Geological Map.
To His Excellency Levi Lincoln, Esq. Gov. of Massachusetts.
Having in a good measure executed the commission received from your Excellency, bearing date June 25, 1830, and directing me to make a geological examination of the State; I beg leave to present you with the first part of my Report.
My commission contemplates an exhibition of the different rock formations in the State, upon the map of the Commonwealth now in progress. But as it must necessarily be a period of considerable length before that work can be completed, I have constructed a small map from such materials as already exist, and delineated upon it the various kinds of rock that prevail in the State. These are shown by different colors and simple markings, easily understood by reference to the tablets on the lower part of the sheet.
To avoid confusion, I have placed on this map only so much of topography and geography, as was absolutely necessary. All the mountains and smaller rivers, with the boundaries of the towns, have been omitted; the center of each town being indicated by a small circle. For the same reason, I have employed only six different colors to mark the rocks; although more than twenty kinds are represented.
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