Koonalda cave, Australia, carved lattice pattern
Seneca cavern, Ohio, carved lattice or grid pattern
If one compares this grid to a profile of the cavern system (last photo), it seems the grid could be a kind of map. There are seven levels to the cavern and seven "ladder sections" in the middle of the grid as seen below.
Seneca cavern 25cm grid with markups highlighting lines. The starts and stops indicate the grid was constructed with deliberation greater than just etching perpendicular lines. There is small amount of modern grafitti in the cavern from the 19th and early 20th centuries before the landowner installed an iron gate. It is along the line of "James loves Harriet." Although there is no way to prove these are prehistoric grids, their underground river context similar to Koonalda's, supports their antiquity.
Seneca cavern 25cm grid with markups highlighting lines. The starts and stops indicate the grid was constructed with deliberation greater than just etching perpendicular lines. There is small amount of modern grafitti in the cavern from the 19th and early 20th centuries before the landowner installed an iron gate. It is along the line of "James loves Harriet." Although there is no way to prove these are prehistoric grids, their underground river context similar to Koonalda's, supports their antiquity.
There were other possible art features in this cave which I plan to return to with better lighting and photography equipment. It seems North American cave art needs to be more thoroughly investigated. The landowner said no one had ever examined Seneca cavern for art before my visit.
A second 15 cm grid was next to the larger grid. (click photos to expand)
A profile map of the Seneca caverns, Bellevue, Ohio
-kbj
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