The unearthing of 28 human remains in Mexico, dating back at least four hundred years, suggests a blending of pre-Hispanic and Catholic cultures that were introduced by Spanish colonizers.

The discovery took place during the construction of a scenic pavilion in Mexico City's Chapultepec park in February, when researchers stumbled across a cemetery from the early viceregal period of 1521 to 1620 A.D.

Maria de Lourdes Lopez Camacho, head of archeological salvage and the National History Museum, said what is most striking is that, although the bodies originate from distinct populations, they were buried in the same period.

"Two burial systems have been found to coexist – the Christian burial and the burial in dorsal decubitus: The fetal position, on the side, with pre-Hispanic ceramic or obsidian, precisely from this Mexica or Tepaneca period," Lopez Camacho said, referring to the early viceregal period.

She added that it is possible the individuals had died from the same cause.

"(The fact that) we have three levels of graves and there are a few centimeters that differentiate one level from another... tells us that there could have been one death or many deaths in a short period of time, which could suggest an epidemic," she said.

The burials also suggest that a nearby pre-Hispanic population could have been used as a labor force for the nearby mills, the first industries the Spanish set up, the archeologist added.

Studies conducted by Mexico's Directorate of Archaeological Salvage (DSA) indicate the bodies belong to two different groups and that they had suffered from infections and diseases related to nutritional deficiency. More studies are scheduled.

Mexico's National Institute of Anthropology and History (INAH) led the study.