Volcanodle
Puzzle #20 was Crater Lake.
The spectacular 8 x 10 km Crater Lake caldera in the southern Cascades of Oregon formed about 7,700 years ago as a result of the collapse of a complex of overlapping shield and stratovolcanoes known as Mount Mazama. The cone-building stage, during which at least five andesitic and dacitic shields and stratovolcanoes were constructed, took place between about 420 and 40 thousand years ago (ka).
Read about it at the Global Volcanism Program →
Global Volcanism Program, Smithsonian Institution
What the record says
Puzzle 20 ran on 29 Jul 2026 and the answer was Crater Lake, played with 6 guesses against 8 columns. On the record: Country - United States; Region - North America Volcanic Regions; Type - caldera; Tectonic setting - subduction; Elevation - 1500-3000; Last eruption - older-Holocene; Rock type - dacite; Historically observed - observed.
Beyond the grid the record adds Largest recorded eruption - VEI 7; Holocene eruptions recorded - 5 eruptions.
Volcanodle builds its record from Global Volcanism Program, Smithsonian Institution (Venzke, E. (ed.), Volcanoes of the World, volcano.si.edu). The description above comes from the same place the game credits on every reveal: A verbatim excerpt of the volcano's GVP Geological Summary. The puzzle itself is still playable in the archive, and every answer that has been and gone is listed on the past-answers page.
How it scored
- Country
- United States
- Region
- North America Volcanic Regions
- Type
- caldera
- Tectonic setting
- subduction
- Elevation
- 1500-3000
- Last eruption
- older-Holocene
- Rock type
- dacite
- Historically observed
- observed
Also on the record
- Largest recorded eruption
- VEI 7
- Holocene eruptions recorded
- 5 eruptions