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Archaeologists working in Costa Rica have discovered thousands of solid stone spheres, some as small as four inches in diameter. Others are up to eight feet round. Some of these spheres are sixteen hundred years old. Yet, they are all perfectly shaped spheres. How were these objects made? And what purpose did they serve?
The stone spheres of Costa Rica have been found in clusters of up to twenty, and often in geometric patterns such as triangles, rectangles or straight lines. Such alignments often point to the earth’s magnetic north. A large number of the spheres have been located in the Diquis River Delta, with other popular sites being the southern cities of Palmar, Sur, Buenos Aires and Golfito as well as in the province of Guanacaste to the north and in the central valley. Archaeologists have been able to date the stones by the artefacts that have been found lying alongside them. Some of them have, thus, been dated as far back as 400 C.E. The majority of them have, however, been dated between 800 and 1200 C.E. Many of these stones have been found near the remains of dwellings and in close proximity to grave sites. Some believed that the stones contained some hidden treasures and a few of them have been smashed to try to get at this supposed treasure. None has been forthcoming, however. Despite these losses, however, the National museum of Costa Rica has catalogued some one hundred and thirty existing stone spheres. However, many of them are not catalogued. This is because of the fact that many of the spheres have been removed from their original sites and used as ornaments in private homes, gardens and churches. Clearly, there are also many stones that still lie undiscovered.
Just how the ancient people of Costa Rica made these perfectly cylindrical stone spheres, remains largely a mystery. It is clear that some sort of mechanical procedure was needed in order to attain the precision displayed by the stones. Statues emanating from the same period show that the ancient Costa Ricans were very skilled sculptors. The existence of gold artefacts from about 800 C.E. also show that the people living at that time were experienced at working with high temperatures. It is, therefore, believed by some researchers that the stones were moulded into their perfectly cylindrical shapes by extreme heating followed by cooling, to remove any outer layers of rock. The rocks could have been finished by polishing with sand or leather.
The larger stones were clearly crafted by the most skilled sculptors. These stones are so perfectly shaped that the tape and plumb bob measurements of diameters reveal no imperfections. This shows that the makers of the stones must have had a degree of mathematical ability as well as advanced knowledge of stone carving and the use of tools. The ancient Costa Ricans, however, had no written language. There is, therefore, no written record of just how they made the stones spheres.
Many of the spheres are made of granite like rock. Yet the granite rock quarries were often twenty five to thirty miles away from the location of the largest stone spheres. How, then, did the sculptors move such heavy stones? Some of the stones, after all weigh sixteen tons. If the granites rocks were moved before they were sculpted, then the nine foot cube that would be needed to sculpt a sphere eight feet in diameter would weigh a whopping twenty four tons. To even get such a massive stone to it’s final location the natives would have to cut large tracks through very dense bush.
Other stones were made of coquina, a limestone like material which is found on the beaches near the mouth of the Diquis river. This stone was probably rafted up river about thirty miles to it’s final location. Some of these stone spheres have been found on Cano Island, which is located about twelve miles off the Pacific coast.
As to why the stone spheres were made, there are, as yet, no explanations. It is possible that they were used as a symbol of rank or importance for a tribal chief or a village. Then again, they may have been used as religious or ceremonial symbols. Perhaps further study by archaeologists will unravel the secrets of the stone spheres of Costa Rica.
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