Historic Bedrock Maps of Ohio

The Ohio Geological Survey has researched and mapped the state's geology since 1837 and beginning with second State Geologist John Newberry, the Survey has created maps and cross sections depicting the state's bedrock geology. Scanned copies of these rare, historic maps are now available and make excellent tools for illustrating the history of geologic research in Ohio and how our understanding of the state's geology progressed during the past 175 years.

The maps are available for free in PDF format (see links below), or you may order a printed poster from the Geologic Records Center at (614) 265-6576; e-mail: geo.survey@dnr.state.oh.us. Posters are printed on high-quality, premium paper and will be rolled and shipped in a mailing tube. Prices exclude tax and shipping.

Click for Preview	1870 Preliminary Geological Map of Ohio
	Poster:	22" x 26" Download [2.8 MB PDF] or order a printed copy
	Author(s):	John Strong Newberry
	Notes:	The first official geologic map of the state, the hand-colored 1870 map also features two cross sections, one for northern Ohio and one for southern Ohio. This map has been enlarged from its original size of 11½" x 14". $13.50 (plus tax and shipping)
Click for Preview	1888 Geological Map of Ohio
	Poster:	30" x 31" Download [22.6 MB PDF] or order a printed copy
	Author(s):	Edward Orton, Sr.
	Notes:	Published in 1888, this updated geologic map of the state was published as an accompaniment of Volume VI: Economic Geology and recognizes seven separate geologic units. $18.50 (plus tax and shipping)
Click for Preview	1909 Geological Map of Ohio
	Poster:	31" x 33" Download [5.4 MB PDF] or order a printed copy
	Author(s):	John A. Bownocker
	Notes:	The 1909 geologic map was the first to recognize the Ordovician System in Ohio. It also featured oil and gas fields, salt works, gypsum mines, and portland cement works, along with other new geologic information. $18.50 (plus tax and shipping)
Click for Preview	1920 Geologic Map of Ohio
	Poster:	32" x 40" Download [6.6 MB PDF] or order a printed copy
	Author(s):	John A. Bownocker
	Notes:	The most detailed to that point, the 1920 geologic map was aided by complete topographic coverage for the entire state and features a revised cross section. $18.50 (plus tax and shipping)

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Last update May 24, 2012