 Last century, Charles Wiener discovered the mausoleums of Utcubamba; the mausoleums of Revash in Santo Tomás were studied later by the archaeologists Henry and Paule Reichlen primarily because the roof of one of the mausoleums had collapsed, covering and protecting the cultural remains.Between 1983 and 1986, the Antisuyo expeditions of the Amazon Archaeology Institute, identified and thoroughly documented diverse groups of undiscovered mausoleums like the ones in Ochín and many others in the surrounding areas of Revash.Other groups of sarcofagi also exist in La Petaca (Leimebamba); these particular sarcofagi are different from those previously mentioned; they appear in cliffs, like tiny houses stuck to the rock and their walls were not rendered in the same way as the other mausoleums.