Balanced Rock is shaped by erosion that sculpts more than arches, revealing the layers behind its striking form. A caprock of the hard Slick Rock Member of the Entrada Sandstone rests on a pedestal of mudstone. This softer Dewey Bridge Member of the Carmel Formation weathers more quickly than the resistant rock above, and as it erodes faster it will eventually cause Balanced Rock to collapse. Elsewhere throughout the park, other balanced rocks, spires, and pinnacles form as different rock layers erode at different rates. Balanced Rock has a total height of 128 feet (39 meters), with a boulder 55 feet (17 meters) high weighing 3,500 tons, or over 3 million kilograms. Chip-Off-the-Old-Block stood beside Balanced Rock until it toppled during the winter of 1975-76.