Piedmont / Central Appalachian Mafic / Calcareous Cliff – CEGL006479
An exposed cliff of red Triassic siltstone along the Potomac River at Red Rock Overlook Regional Park in Loudoun County. Wild hydrangea (Hydrangea arborescens, flowering at top) is a common shrub on the cliff-face. © DCR-DNH, Gary P. Fleming