The River Styx archaeological site is the site of a village and burial mound in North Central Florida that was occupied during the development of the Cades Pond culture out of the Deptford culture early in the Current Era (CE).
Late Deptford sites on the Gulf coast built shell mounds.
Horseshoe-shaped shell rings appeared in Deptford sites along the Big Bend Coast starting in the first century CE.
Several early Cades Pond sites, including River Styx, Ramsey Pasture and Cross Creek, had horseshoe shaped sand mounds or earthworks resembling the shell rings, with the added feature of a central mound used for burials.
Most of the pottery found at the River Styx site has been classified as Deptford series, including ceramics resembling the Yent Complex.
The fairly common St. Johns series pots point to origins in northeast Florida.
The River Styx site has been compared to the more elaborate Crystal River (Deptford and Santa Rosa-Swift Creek culture) and Fort Center (Belle Glade culture) sites elsewhere in Florida.