What is yakima fold belt?

The Yakima Fold Belt is a geological region located in the Pacific Northwest of the United States. It extends from southern British Columbia to central Oregon, covering a distance of over 600 miles. The fold belt is characterized by a series of anticlines and synclines that were formed by the compressional forces of tectonic activity during the Late Eocene and Early Miocene periods. The Yakima Fold Belt is primarily composed of sedimentary rocks, including sandstone, shale, and siltstone, that were deposited in shallow marine environments. Fossils of marine animals such as mollusks and crinoids can be found in the rocks of the fold belt. The Yakima Fold Belt plays an important role in the geology of the Pacific Northwest, as it is associated with the formation of the Cascade Range and the Columbia River Basalt Group.