The University Libraries' Mesoamerican codices collection consists of high quality facsimiles held in Special Collections, mass published facsimiles found on our shelves, early microfilm proxies of originals, and scholarly interpretations.
The obverse of the manuscript has been interpreted as of a ritual-calendrical nature, but it also contains mythological genealogies with some emphasis on 9 Wind (Quetzalcoatl), lists of place glyphs and dates, and of persons, gods, or priests. Each of its 10 major sections repeats data pertaining to a ritual or ceremony in which a constant element is fire-making. The reverse presents a genealogy that begins two generations before the inception of the first Tilantongo dynasty and continues through the marriage of the third rulers of the third dynasty. This span corresponds to a period from the eighth century through the middle of the fourteenth century.