Four Craters Lava Field facts for kids

Quick facts for kids Four Craters Lava Field
Craters of the aptly named Four Craters Lava Field are seen here from the NW on Green Mountain.
Highest point
Elevation	4,924 ft (1,501 m)
Geography
Location	Lake County, Oregon, U.S.
Geology
Age of rock	Pleistocene
Mountain type	volcanic field
Last eruption	< 50,000 years ago

Four Craters Lava Field is a basaltic volcanic field located south east of Newberry Caldera in the U.S. state of Oregon. The volcanic field covers about 30 square kilometers. Four Pleistocene cinder cones are the source of the flows in the field and are aligned along a fissure trending N 30° W. The cones rise 75 to 120 meters above the flows and the distance between the northernmost and southernmost cones is about 3.5 kilometers.

Closely related to the Four Craters lava field is Crack-in-the-Ground located at the southwest corner of the field. The eruptions from the field were accompanied by a slight sinking of the older rock surface. This shallow, graben-like sink is about 3 kilometers wide and extends to the south into an old lake basin. Crack-in-the-Ground marks the western edge of this small, volcano-tectonic depression and is nearly 9 meters deep and over a meter wide. The crack is the result of a tension fracture along a hingeline produced by the draping of Green Mountain lava flows over the edge of upthrown side of the concealed fault zone.