page_title: Lemei Rock
section_title: Geology
hierarchical_section_title: Lemei Rock / Geology
caption_attribution_description: English: The South Cascades region of Washington (mainly the Gifford Pinchot National Forest) is characterized by ancient volcanic activity. The map shows the locations of the major eruptive volcanoes in the region from the Wind River to the 60 eruptive centers which lie on the Indian Heaven fissure zone, northeast to the King Mountain fissure zone along which Mount Adams was built.
context_page_description: Lemei Rock is a shield volcano, and part of the Indian Heaven polygenetic volcanic field in Washington, United States. It is located midway between Mount St. Helens and Mount Adams, and dates from the Pleistocene and Holocene. Lemei Rock is the highest point at 5,925 feet.
context_section_description: Lemei Rock is one of the many shield volcanoes topped by cinder cones and spatter cones that make up the Indian Heaven Volcanic Field. About 60 eruptive centers lie on the 19-mile (30 km) long, N10°E-trending, Indian Heaven fissure zone. The 230 square miles (600 km²) field has a volume of about 20 cubic miles (100 km³) and forms the western part of a 770-square-mile (2,000 km²) Quaternary basalt field in the southern Washington Cascades, including the King Mountain fissure zone along which Mount Adams was built.
caption: Indian Heaven Volcanic Field and Mount Adams Volcanic Vicinity Digital Relief Map showing Lemei Rock and the various other peaks that make up the volcanic field.
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