Illness delayed him at Santa Fe, and after seeing the fossilised casing of a huge armadillo embedded in rock, he was puzzled to find a horse tooth in the same rock layer, since horses had been introduced to the continent with European migration.
A enfermidade retívoo en Santa Fe, e despois de ver a coiraza fosilizada dun enorme armadillo incrustada nunha rocha, quedou desconcertado ao atopar un dente de cabalo na mesma capa de rocha, xa que os cabalos foran introducidos no continente coa chegada dos europeos.