Here's a Quicktime animation allowing you to rotate the slab and look at its top face from different angles.
The stone is a flat triangular sandstone slab measuring about 1.5 m across, with a shallow V-shaped trough carved on one side, and half a funnel-shaped depression remaining between the arms of the V. The funnel looks like half a water drain. The trough looks a bit like a bird bath, an interpretation considered by the finder.
I have no detailed information as to the find context. The spot (N 38°42.867,W 083°34.116) is about 200 m from an old cabin foundation. Other finds include "broken flint pieces".
I believe that the finder has been misled in his archaeo-astronomical interpretation by zoologist and nutty-fringe epigraphist Barry Fell who corresponded with him on the matter in 1979. An archaeologist has also told him that the carving has been made with stone tools, which seems highly unlikely.
Writes Steve C. Gordon:
For much of the nineteenth and early twentieth centuries, Ohio was a national leader in the production of building stones ...The object is in my view most likely a piece of recent post-Columbian building stone having something to do with water (viz the funnel-shaped drain).
In simple terms, the building stones of Ohio are all sedimentary rocks represented by fossiliferous limestone and carboniferous sandstone. Ohio's earliest commercial sandstone quarries, located near Buena Vista in Scioto County, were opened ca. 1830 and supplied much of the quality "freestone" used in buildings along fashionable streets in Portsmouth and Cincinnati. Commercial sandstone quarries opened in Berea and South Amherst in northeastern Ohio a few years later. These became one of the nation's chief sources of buff-colored sandstone.
Sandstone, softer, less friable, and more uniform in texture than limestone, was well suited to architectural details, finish work, and carved ornament. Blocks of it with neatly tooled margins were frequently used for foundations and wall surfaces, plinths, quoins, beltcourses, lintels, and lugsills. Its virtuosity as a building stone and decorative element would not be challenged until the mass production of terracotta and concrete. [Link]
[More blog entries about archaeology, Ohio; arkeologi, Ohio.]