description Black Point (Mono Lake) Overview
Black Point is a volcanic feature on the northern shore of Mono Lake in eastern California. It formed about 13,000 years ago through explosive interaction between rising magma and lake water when Mono Lake stood substantially higher than it does today, producing a basaltic tuff cone beneath the water. Erosion later exposed the cone and opened narrow fissures in its upper surface, providing visible evidence of both volcanic fragmentation and deformation within the cooling deposit.
help Black Point (Mono Lake) FAQ
Was Black Point formed above or below Mono Lake?
Black Point began as a basaltic cone below the water of a much higher Mono Lake, in the basin's older Lake Russell setting. The USGS dates its formation to about 13,300 years ago. [USGS Mono Lake Volcanic Field](https://www.usgs.gov/volcanoes/mono-lake-volcanic-field)
What made the eruption that formed Black Point explosive?
Rising basaltic magma met lake water, creating a phreatomagmatic or Surtseyan-style eruption instead of a quiet lava flow. Geological studies place the vent beneath roughly 105 meters of water. [Black Point eruption study](https://www.sciencedirect.com/science/article/abs/pii/S0377027313002576)
Why is Black Point called a tuff cone?
The cone was built from fragmented volcanic material produced when magma and lake water interacted explosively. That water-driven fragmentation is what makes Black Point a tuff cone rather than an ordinary dry-land cinder cone. [USGS Mono Lake Volcanic Field](https://www.usgs.gov/volcanoes/mono-lake-volcanic-field)
How does Black Point relate to the Mono Craters?
Black Point belongs to the Mono Lake volcanic field and is mainly basaltic, while the nearby Mono Craters are known for silica-rich rhyolite domes. They are related to the same volcanic region but are not the same volcano or rock type. [USGS Mono Lake Volcanic Field](https://www.usgs.gov/volcanoes/mono-lake-volcanic-field)
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