Coatepeque caldera is a collapse caldera.
It has an elliptical shape measuring 11 x 7 km
with a lake measuring 5 x 6 km and a depth of approximately
120 m.
The first caldera dates from a plinian eruption about 70,000
years ago.
A second smaller plinian eruption occured about 50,000 years
ago.
The most recent acivity was the formation of the Cerro Paco
rhyolite dome,
probably within the last 10,000 years.
The stamp below was issued October 11th, 1990
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