Saxony Switzerland is a popular climbing region that lies along the Czech border. Geologically, the area's peaks and valleys were formed through the erosion of sea sediments deposited millions of years ago and consist of lithified layers of rough grains of quartz, clay, and fine marlstone. Similar to the rock-cut tombs of Petra, Jordan, then, from what type of sedimentary rock are the region's mountains primarily formed?
Sandstone