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A stone sphere believed to belong to indigenous tribes of Costa Rica has been found near the Osa Peninsula by archaeologists. This is not the first time an ancient artifact like this has been found.
The spheres are believed to be from the Chiriqui period from 800 to 1500 AD.
It is believed, based upon contextual information, that the spheres are to product of the Diquis culture, during their period of from 500 CE to 700 CE (AD). However, as these artifacts are of stone, and there is the possibility of relocation, and other environmental factors, proper dating for their creation is somewhat speculative. There are others who speculate that the age of the spheres extends back as far as 4,000 years and the products of a much older culture
"The best spheres are perhaps the finest examples of precision stone carving in the ancient world." The maximum circumference error in one 6-foot, 7-inch diameter sphere in only 0.5 inch, or 0.2%
Whatever "mystery" exists has more to do with loss of information due to the destruction of the balls and their archaeological contexts than lost continents, ancient astronauts, or transoceanic voyages.
Hundreds of stone balls have been documented in Costa Rica, ranging in size from a few centimeters to over two meters in diameter. Almost all of them are made of granodiorite, a hard, igneous stone. These objects are not natural in origin, unlike the stone balls in Jalisco, Mexico that were described in a 1965 National Geographic article. Rather, they are monolithic sculptures made by human hands.
Many of the balls were found to be in alignments, consisting of straight and curved lines, as well as triangles and parallelograms. One group of four balls was found to be arranged in a line oriented to magnetic north. This has led to speculation that they may have been arranged by people familiar with the use of magnetic compasses, or astronomical alignments. Unfortunately, all but a few of these alignments were destroyed when the balls were moved from their original locations, so measurements made almost fifty years ago cannot be checked for accuracy. Many of the balls, some of them in alignments, were found on top of low mounds.