Task: Question Answering
Input (English): Passage: A Late Preclassic tomb has been excavated, believed to be a royal burial. This tomb has been designated Burial 1; it was found during excavations of Structure 7A and was inserted into the centre of this Middle Preclassic structure. The burial is also associated with Stela 13 and with a massive offering of more than 600 ceramic vessels and other artifacts found at the base of Structure 7A. These ceramics date the offering to the end of the Late Preclassic. No human remains have been recovered but the find is assumed to be a burial due to the associated artifacts. The body is believed to have been interred upon a litter measuring 1 by 2 metres (3.3 by 6.6 ft), which was probably made of wood and coated in red cinnabar dust. Grave goods include an 18-piece jade necklace, two earspools coated in cinnabar, various mosaic mirrors made from iron pyrite, one consisting of more than 800 pieces, a jade mosaic mask, two prismatic obsidian blades, a finely carved greenstone fish, various beads that presumably formed jewellery such as bracelets and a selection of ceramics that date the tomb to AD 100–200.In October 2012, a tomb carbon-dated between 700 BC and 400 BC was reported to have been found in Takalik Abaj of a ruler nicknamed K'utz Chman ("Grandfather Vulture" in Mam) by archaeologists, a sacred king or "big chief" who "bridged the gap between the Olmec and Mayan cultures in Central America," according to Miguel Orrego. The tomb is suggested to be the oldest Maya royal burial to have been discovered so far. 
Question: What was coated in red cinnabar dust?
Output (English): litter.