La Boca arch lies just off the Dome Plateau Trail north and east of Arches National Park in Utah. The arch cuts through sandstone of the the same upper Entrada formation exposed in the park to the south. During the Jurassic period about 150 million years ago desert conditions stretched over a good part of Utah, piling light dune sand atop the darker red silt and mud from a previous wetter period. Most of the arches of the area formed in the sandstone created from these dunes.
Utah is a state located in the westcentral region of the United States of America. Utah is the 13th largest state by area, ranks 34th by population and 10th by population density of the 50 United States. Utah was the 45th state to be admitted into the Union, on January 4, 1896. Utah is landlocked, being bordered by the states of Idaho to the north, Wyoming to the northeast, Nevada on the west, Colorado on the east and Arizona to the south. Utah is very mountainous and is a popular outing destination of the outdoorsman. The state population is about 2.82M with 95% being Caucasian, 2.4% Asian, 1.7% Native American and 1.3% Black. The state capital and largest city is Salt Lake City.Source: wikipedia