The Horns of the Emerald Valley

This is a painting of a puzzling rock formation protruding out of nowhere in the middle of the Emerald Valley. The Horns (and The Pillar Pile, in the background) are not sedimentary rock, nor do they have signs of erosion by wind or water. Maybe they were eroded long time before geologists think, and the landscape around them is a lot younger, making the Horns look out of place.