Numerous trees of this species growing in a generally rocky, upland forest, many of the rocks appearing to be basalt or something similar. Acorn cap about 1.5 cm diameter.

This species hasn't been documented in Guilford County since the 1960s, but it's still present here in this surprisingly large population.

I was tipped off to this population here by fallen leaves seen in this observation:
https://www.inaturalist.org/observations/98495883