Rainbow Wells Blog

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 The Cima volcanic field is (-300 km^) Tertiary-Quaternary alkaline basalt field in  the Ivanpah highlands in east-central Mojave Desert. The basaltic rocks,  which range from late Miocene to Holocene, were erupted from at least 71 vents. The younger  vents are well-formed cinder cones, whereas older vents are marked by degraded cinder cones,  plugs, and crater-fill lava flows. https://pubs.usgs.gov/of/1992/0182/report.pdf

Cima volcanic field is a volcanic field in San Bernardino County, California, close to the border with Nevada.[3][4] The volcanic field covers a surface area of 600 km2 (230 sq mi) within the Mojave National Preserve west of the Cima Dome and consists of about 40 volcanic cones with about 60 lava flows. The volcanic cones range from simple cones over multi-cratered mountains to eroded hills, and lava flows are up to 9.1 km (5.7 mi) long. https://en.wikipedia.org/wiki/Cima_volcanic_field