The Bentley site (15Gp15) is a Late Fort Ancient culture Madisonville horizon (post 1400 CE) archaeological site overlain by an 18th-century Shawnee village; it is located within the Lower Shawneetown Archeological District, near South Portsmouth in Greenup County, Kentucky and Lewis County, Kentucky.

[4][5] The site was inhabited continuously from 1400 to about 1625 CE and probably had a population of 250 to 500 people living in long, rectangular houses covered with bark and shared by multiple families, as indicated by the several central hearths and interior partitions.

[9] Also found during the excavations were distinctive Madisonville horizon pottery,[10] including cordmarked, plain and grooved-paddle jars, as well as a variety of chert points, scrapers and ceremonial pipes.

Tobacco pipes made of stone and ceramic were found, along with a few items of European origin, including copper or brass beads, bracelets, tubes, coils and pendants.

[11] The Fort Ancient residents of southern Ohio were very likely wiped out in the late seventeenth century by infectious diseases brought by Europeans, particularly measles, smallpox, and influenza.