Part II: Very nice again!
Your vertical rock exposure looks to be many yards in length. It appears to be a thin layer of rock emplaced as molten material into a planar fracture in the host rock. Oftentimes the molten material is silica--quartz--which solidifies in place to form a hard, erosion-resistant tabular body which sticks out because the host rock erodes more easily. Especially in the West, we see "dike swarms" in radial patterns around volcanic plugs. Back here in the east, we have thousands of dikes of dark, dense rock called diabase. Our diabase dikes run between just a foot or two in width to hundreds of feet in width. They weather into distinctive spherical cobbles and boulders which litter the surface above the soil cover. These dikes can be traced for miles and miles by the cannonball-like cobbles and the deep red/orange soils they produce.