 The existence of the Great Murals was noted by Jesuit missionaries José Mariano Rotea and Francisco Escalante in the eighteenth century.The first scientific studies were made between 1889 and 1913 by a French naturalist, Léon Diguet.Mexican journalist Fernando Jordan and archaeologists Barbro Dahlgren and Javier Romero reported on Great Mural sites in the early 1950s.