The tombs usually have a 2m deep vertical access shaft that leads to a horizontal vault or chamber where the deceased individuals are placed along with offerings. After burial, the vault is sealed with an adobe wall; an indicative feature of the boot-shaped tomb. Chamber tombs- Chamber tombs are the most complex type of tomb found at San Jose de Moro. The chambers are built in a quadrangular shape with adobe walls and algarrobo beam roofing. The walls of chamber tombs sometimes contain niches or benches along the edges. The content and size of chamber tombs varies with the time period they are associated with. Chamber tombs often contain more than one individual and numerous grave offerings. Moche iconography that appears mostly on Moche ceramics and Moche fine line pottery has come to play an important role in understanding Moche belief systems and ritual ceremonies. As the Moche had no writing system, the detailed art and iconography stands as representation for Moche practices and daily life. Anthropologist Christopher Donnan has even suggested that all Moche art is sacred and that even the most "mundane representations are of religious significance". Moche iconography is also indicative of shamans with depictions of therianthropic beings and intricate rituals. Over the two decades of excavations at San Jose de Moro several burials have been uncovered containing high status female individuals. The importance of these women is indicated by their attire and by the number and nature of the burial offerings in their association. Furthermore, several of the individuals have been in costumes and with ornamentation that is depicted in Moche iconography relaying the Sacrifice and Presentation Ceremony. This complex Moche ceremony consisted of human sacrifice and the offering of human blood in a sacrifice goblet that appears in Moche art. The women buried at San Jose de Moro are wearing the same headdresses and are interned with similar “Sacrifice goblets” that are seen in the iconography of these ceremonies. Their importance in participation in these ritual ceremonies is indicated by the extensive work put into their tombs, their lavish offerings, and the evidence for grand funerary feasts held in their honor. Tomb M-U41, The first Priestess. The individual interred in this tomb was a woman aged 30–40 years old. The woman was accompanied by the same ornamentation as the woman depicted in Moche iconography as the Priestess. The individual was placed in a cane coffin that was covered with copper discs.