 These measurements were then compared against three crania sets from Poland, Mongolia and Uganda to represent three racial categories which allowed Wiercinski to sort each skull into one or more racial categories.Based on his comparisons, Wiercinski found that 14% of the skeletons from Tlatilco and 4.5% of the skeletons from Cerro de las Mesas had elements of "Black" racial composition.In the last section of his paper, Wiercinski compared the physiognomy of the skeletons to corresponding examples of Olmec sculptures and bas-reliefs on the stelas.