Word: layers
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Dates: during 1890-1890
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...largest collection of mounds is the Turner group which contains the famous Large Mound. This is made very carefully and of many kinds of material, the foundation being a circle of stone one hundred feet in diameter, firled in with burnt clay, over which is a layer of mixed iron and gravel packed into a solid mass like concrete. This gravel made a floor for the support of two altars. That the mound was used exclusively for religious rites is certain from the fact that after some great religious festival in which thousands of treasures of all kinds were heaped...