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07-Jul-2020 01:25

“I’ve [also] seen dozens of caves that have inorganic origins, and in these cases, it’s very clear that digging animals had no role in their creation.” In his home state of Rio Grande do Sul, in the far south of Brazil, Frank has documented at least 1,500 paleoburrows so far.In Santa Catarina, just to the north, he’s found hundreds more and counting.It was in 2010 that Amilcar Adamy first investigated rumors of an impressive cave in southern Brazil.A geologist with the Brazilian Geological Survey (known by its Portuguese acronym, CPRM) Adamy was at the time working on a general survey of the Amazonian state of Rondonia.Local geology doesn’t yield such a sight, so Frank went back a few weeks later and crawled inside.It was a single shaft, about 15 feet long; at its end, while on his back, he found what looked like claw marks all over the ceiling.The main shafts – since enlarged by erosion – were originally more than six feet tall and three to five feet wide; an estimated 4,000 metric tons of dirt and rock were dug out of the hillside to create the burrow.

It also turned out to be one of the largest ever measured, with branching tunnels altogether tallying about 2,000 feet in length.Surveying a 45-mile stretch of highway construction near the city of Porto Alegre, for example, Frank and his students identified paleoburrows in more than 70 percent of road cuts.



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