- Most Popular | Most Recent
Kilbourne Hole is a well preserved example of a maar volcano. Here we can see tephra layers blown out by the eruption overlying an older basaltic lava flow. The tephra is relatively light in color, but contains many mantle xenoliths, which makes this a favorite collecting locality for geologists.
This is a closer view of the tephra blanket that erupted from Kilbourne Hole. Some stratification and crossbedding is visible as well as many of the basalt clasts and other debris that was disrupted by the eruption. Good luck trying to spot a mantle xenolith at this locality, though - it's on the south side of the cr...