Blocktown, 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 Kenton quadrangle1:62500
• 1944 USGS Kenton quadrangle1:62500
• 1950 USGS Marion quadrangle1:250000
• 1961 USGS Foraker quadrangle1:24000
• 1961 USGS Foraker quadrangle1:24000
• 1962 USGS Marion quadrangle1:250000
• 1966 USGS Marion quadrangle1:250000
• 1966 USGS Marion quadrangle1:250000
• 1966 USGS Marion quadrangle1:250000
• 1986 USGS Marion quadrangle1:100000
• 1986 USGS Marion quadrangle1:100000

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

Regional context, not property-specific evidence. Museums hold 369 specimens collected within 10 miles of Blocktown (historical) between 1885 and 1973: 200 Protozoa, 108 Animalia, 33 Plantae, 27 Fungi, 1 Unrecorded. 12 distinct Species records are shown. Collected by ?, A. P. Morgan, A. P. M. 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
	Ustilago tritici (Bjerk.) Rostr.	1923	W.G. Stover	Kenton
	Procambarus blandingii (Harlan, 1830)	1939	J. Pelton	Pond near Kenton
	unnamed	1942	?
	Bovistella radicata (Durieu & Mont.) Pat.	1885	A. P. Morgan	Preston
	Gloeophyllum trabeum (Pers.) Murrill	1886	A. P. Morgan	Preston
	Craterium leucocephalum (Pers. ex J.F.Gmel.) Ditmar, 1813	1888	Morgan, A. P.	Ohio: Preston
	Diderma floriforme (Bull.) Pers., 1794	1888	not recorded	Ohio: Preston
	Calonema aureum Morgan, 1893	1889	Morgan, A. P.; Preston, O.
	Tapesia derelicta Morgan	1889	A. P. Morgan	Preston
	Metatrichia vesparia (Batsch) Nann.-Bremek. ex G.W.Martin & Alexop., 1969	1890	Morgan, A. P.; Preston,O.
	Physarum serpula Morgan, 1896	1892	Morgan A. P.	United States-- Ohio, Preston
	Trichia favoginea (Batsch) Pers., 1794	1892	Morgan, A. P.	Ohio: Preston

All 369 specimens within 10 miles, at the Global Biodiversity Information Facility.

Regional context, not property-specific evidence. The federal mineral resources record lists 2 workings within 5 miles of Blocktown (historical): 1 past producer, 1 producer. 1 still produces. What was taken out: Limestone, General. 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 Hardin 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 1055402. 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.