Speaking of curious rock outcroppings on old maps, I have taken note of two on W. L. Spoon's 1893 Map of Alamance County. The first one is "Indian Rock" which is shown in the fork between the North Prong and the South Prong of Stinking Quarter Creek. This site would be a little ways upstream of the Friendship-Patterson Road bridge over Stinking Quarter Creek. Here's a detail from Spoon:
The other spot is Buzzard Rock which is shown on the Spoon Map a little downstream of the village of Alamance on Big Alamance Creek:
I don't know what either of these places are or what the origin of either name is, but it would be interesting to locate these two rock outcroppings today.