Delphi, Ohio

The same ground, surveyed 71 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1915 1986

Matched by testing this settlement's coordinate against the published boundary of every sheet in the United States Geological Survey's historical collection. Each opens the scanned sheet at the Survey.

• 1915 USGS Norwalk quadrangle1:62500
• 1915 USGS Norwalk quadrangle1:62500
• 1944 USGS Norwalk quadrangle1:62500
• 1956 USGS Toledo quadrangle1:250000
• 1956 USGS Toledo quadrangle1:250000
• 1956 USGS Toledo quadrangle1:250000
• 1956 USGS Toledo quadrangle1:250000
• 1960 USGS Greenwich quadrangle1:24000
• 1960 USGS Greenwich quadrangle1:24000
• 1960 USGS Greenwich quadrangle1:24000
• 1961 USGS Toledo quadrangle1:250000
• 1986 USGS Lorain quadrangle1:100000
• 1986 USGS Lorain quadrangle1:100000

The county-history sources names this settlement in its chapter on Ripley Township. These are the passages that mention it, exactly as the scans read.

Regional context, not property-specific evidence. Museums hold 667 specimens collected within 10 miles of Delphi between 1885 and 1974: 513 Plantae, 73 Animalia, 66 Fungi, 15 Protozoa. 12 distinct Species records are shown. Collected by A. P. Morgan, Baumgartner, L., C. E. Jennings and others. Each is a physical object with a catalogue number, and each entry opens the museum's record. This is what was collected and kept, not a survey of what lives here - nothing can be concluded from a species being absent.

Image	Species	Year	Collected by	Where, as recorded
	Hemiarcyria stipata (Schwein.) Rostaf., 1876	1885	A. P. Morgan	Preston
	Physarum inaequale Peck, 1878	1885	A. P. Morgan	Preston
	Chondrioderma spumarioides (Fr. & Palmquist) Rostaf., 1873	1886	A. P. Morgan	Preston
	Trichia proximella P.Karst., 1879	1889	A. P. Morgan	Preston
	Tubifera ferruginosa (Batsch) J.F.Gmel., 1792	1889	A. P. Morgan	Preston
	Didymium melanospermum (Pers.) T.Macbr., 1899	1890	A. P. Morgan	Preston
	Physarum ellipsosporum Rostaf., 1876	1890	A. P. Morgan	Preston
	Physarum relatum Morgan, 1896	1890	A. P. Morgan	Preston
	Calonema aureum Morgan, 1893	1891	A. P. Morgan	Preston
	Didymium eximium Peck, 1878	1891	A. P. Morgan	Preston
	Physarum compressum Alb. & Schwein., 1805	1891	A. P. Morgan	Preston
	Physarum sulphureum Alb. & Schwein., 1805	1891	A. P. Morgan	Preston

All 667 specimens within 10 miles, at the Global Biodiversity Information Facility.

Regional context, not property-specific evidence. The federal mineral resources record lists 5 workings within 5 miles of Delphi: 5 past producers. None of them still produces. What was taken out: Sand and Gravel, Construction. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Every working recorded in Huron County

The eight closest, with where each one stands in the county. Distances are straight-line, computed from the Geographic Names Information System coordinates.

This settlement is recorded in the Geographic Names Information System as feature 1064527. The sheet list is computed by point-in-boundary test against the United States Geological Survey's historical topographic inventory. Both are works of the United States government and carry no copyright under 17 U.S.C. 105.

Specimens. Global Biodiversity Information Facility (GBIF), https://www.gbif.org/. Only records licensed CC0 or CC BY are used. Records licensed CC BY-NC are excluded because this site carries advertising. Images are checked individually and any whose licence is non-commercial, no-derivatives or unreadable is refused.

Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.