There are three types of mounds: linear ridgetop mounds, which may have served as location markers, although some contain graves; conical mounds, which may also have been used for burial; and platform mounds, which range in height from a few feet [about a meter] to a hundred feet [30 m] and served as a base for constructing buildings.
Šos uzbērumus var iedalīt trīs grupās: garenos pakalnos ar jumta korei līdzīgu virsotni, kurus, iespējams, izmantoja vietas iezīmēšanai un dažkārt kā kapukalnus, konusveida pakalnos, kuros lielākoties tika izveidotas kapenes, un platformveida pakalnos, kuru augstums variē no viena līdz trīsdesmit metriem un kuri tika izmantoti par pamatu dažādām ēkām.