README file for Cadwallader (2017) Research data supporting "Doubts about How the Middle Horizon Collapsed (ca. A.D. 1000) and Other Insights from the Looted Cemeteries of the Lower Ica Valley, South Coast of Peru". DOI: 10.17863/CAM.22272. This dataset is made up of a number of files and folders. All the data was collected in 2010 in two field seasons. The files/folders are as follows: GPS_locations_of_site_perimeters.csv This file gives the GPS coordinates of the limits of the sites recorded in 2010 and also mid points of some sites. These were used to draw the maps of the sites presented in the associated publication. Photo_register_all_sites.csv This file gives contextual information to the photographs contained in the zip folders. Contextual information includes: site, sector (where applicable), date taken, GPS coordinates and altitude (M.A.S.L) (when recorded), brief description of photograph. Photographs_of_sites.zip This zip contains seven folders - one for each of the sites discussed in the paper. Each folder contains photographs illustrating the burial archaeology of that site. Some photographs include images of human remains.