The Primordial Mound is believed to be the mound of earth which life sprang from on earth - by the ancient egyptians.
Primordial may mean that it was in existence before the birth of time e.g before days were ordered.
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my answer is builders mound
Ohio the serpent mound is located in Ohio.
Grove Creek Mound
Kościuszko Mound was created in 1823.
Mound of Glory was created in 1969.