You mean the Hardy Boys had it wrong??
Seriously, what is Skull Cave? That article from Archaeology about syphilis being a New World mutation of yaws was an eye-opener; I'm beginning to develop some interest in archaeology, after too many years of ignoring it.
Cheers!
Abstract
In February 1866, workers found a human skull deep in a mine in Calaveras County, California, believed at first to be of Pliocene age. It was passed through several hands before reaching J. D. Whitney, State Geologist of California and Professor of Geology at Harvard University.
While some scientists accepted it on face value, other scientists and the public press refused to believe it and even ridiculed the claim. Some believed it was a "plant," while others had faith in the reports of the miners, which led to a long controversy.
Apparently two skulls became confused in transmission from one person to another, but in the end they were identified as fossilized Indian skulls of modern type, and it was finally admitted that the one taken from the mine was "planted" as a joke.