can you elaborate a bit on this field of study?
It is the study of human activity through the recovery and analysis of material culture.
Archaeology
Archaeology, sometimes spelled archeology, is the study of human activity through the recovery and analysis of material culture. 
when did kingdom of the crystal skull take place The film is set in 1957. who is the protagonist of this film? Indiana Jones. what is he/she by profession? He is a fictional professor of Archaeology.
wiki:22068355
Archaeology [SEP] Introduction
Archaeology, sometimes spelled archeology, is the study of human activity through the recovery and analysis of material culture. Archaeology is often considered a branch of socio-cultural anthropology, but archaeologists also draw from biological, geological, and environmental systems through their study of the past. The archaeological record consists of artifacts, architecture, biofacts or ecofacts and cultural landscapes. Archaeology can be considered both a social science and a branch of the humanities. In Europe it is often viewed as either a discipline in its own right or a sub-field of other disciplines, while in North America archaeology is a sub-field of anthropology.