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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.
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.
It turned out to be the first paleoburrow discovered in the Amazon, which is notable, but not the coolest part.
It also turned out to be one of the largest ever measured, with branching tunnels altogether tallying about 2,000 feet in length.
He and his colleagues consider as possibilities several genera that once lived in South America and whose fossil remains suggest adaptation for serious digging: , though smaller than the sloths, were responsible for even the largest burrows.
Regardless, the sheer size of the burrows is something that Frank and his colleagues are still trying to explain.
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.
Extrapolating from the original size of the hill sliced away for the highway, he calculated that the original burrow was about 250 feet long, not counting for twists and turns that it surely once included.Tags: Adult Dating, affair dating, sex dating