|The mysterious grassy mound at Split Rock. The rock formation is behind it, hidden by trees.|
We stayed at the nearby Split Rock Resort and Lake Harmony last month and took one day to visit this strange rock formation, which was created 300 million ago when glaciers swept across the land and also created Lake Harmony.
|Drone view of Split Rock with the cleft near middle|
|P. virgatum spikelets|
|P. virgatum spikelet showing purple stigmas and orange anthers|
|A. virginicus spikelet. (A) Sessile fertile floret with long awn. (B) Sterile floret on a stalk. (C) Disconnected raceme connection to the other spikelets.|
If you ever visit this area in Pennsylvania, then take some time to get a glimpse of this mysterious mound with its trove of native grasses, and the riven rock behind it. Just don't do it in the dark!