A. Preliminary Geological Map of Connecticut, by H.E. Gregory and H.H. Robinson, dated 1907, printed color, (26.5 x 23.5"). Very detailed map shows 39 different geologic units in the state. Includes an octavo, hardbound, 39 pp. supplement. Condition: A few tiny splits at fold intersections on the map, else very good. Supplement is good with some light toning of the text, the hinge is starting, and the covers are lightly worn.

B. Geological Map of Connecticut Valley Triassic Area..., by Lull, circa 1915, black & white (7.8" x 27.5"). Covers the area from New Haven north to Greenfield County, Massachusetts displaying the pre-triassic crystalline rocks, triassic sedimentary rocks, and contemporaneous sheets of trap. Condition: There are a few minor spots in the image and a hint of toning.

References:

Condition: B+

See descriptions above.