be found in the mountain's numerous, cross-cutting felsic dikes. Embedded in the granite are xenoliths or pieces of foreign rocks entrained in the magma. The granite intruded into the metamorphic rocks of the Piedmont region during the last stages of the Alleghenian Orogeny, which was the time when North America and North Africa collided. Over time, erosion eventually exposed the present mountain of more resistant igneous rock. This intrusion of granite also gave rise to Panola Mountain and Arabia Mountain, both in DeKalb County, smaller outcroppings farther south of Stone Mountain. Natural history The top of the mountain is a landscape of bare rock and rock pools, and it provides views of the surrounding area including the skyline of downtown Atlanta, often Kennesaw Mountain, and on very clear days even the Appalachian Mountains. On some days, the top of the mountain is shrouded in a heavy fog, and visibility may be limited to only a few feet. The clear freshwater pools on the summit form by rainwater gathering in eroded depressions, and are home to unusual clam shrimp and fairy shrimp. The tiny shrimp appear only during the rainy season. Through the process of cryptobiosis, the tiny shrimp eggs (or cysts) can remain dormant for years in the dried out depressions, awaiting favorable conditions. These vernal pools are also home to several federally listed rare and endangered plant species, such as black-spored quillwort (Isoetes melanospora) and pool sprite (also called snorkelwort, Gratiola amphiantha). The mountain's lower slopes are wooded. The rare Georgia oak was first discovered at the summit, and several specimens can easily be found along the walk-up trail and in the woods around the base of the mountain. In the fall, the Confederate yellow daisy (Helianthus porteri) flowers appear on the mountain, growing in rock crevices and in the large wooded areas. More than 120 wildflowers, most of them native to the Southern Appalachians and including several rare or federally protected species, have been identified on the mountain. Confederate Memorial Carving The largest bas-relief sculpture in the world, the Confederate Memorial Carving depicts three Confederate leaders of the Civil War: President Jefferson Davis and Generals Robert E. Lee and Thomas J. "Stonewall" Jackson (on their favorite horses, Blackjack, Traveller, and Little Sorrel, respectively). The sculpture was cut deep into the mountain, measures in height and in width, and lies above the ground. David Freeman, writing on the origins