The most important mountain building period on Dominica was
in the Pleistocene.
At that time a line of dacitic-andesitic composite volcanoes
was superimposed over the less lofty earlier shield volcanoes:
Morne au Diable (Pelean), Morne Diablotins, Morne Watt, Morne
Anglais, and Morne Plat-Pays, are all about 400,000-500,000 years old.
Only 30,000 years ago, a very large eruption, the Roseau ignimbrite
took place from near where Trois Pitons stands.
Ash and pumice flows filled several valleys and the deposits
extended several hundred km from Dominica.
The whole deposit is equal in volume to about 60 cubic kilometres
of solid rock.
The stamps below were issued several times between 1903 and
1921
in three watermarks and on chalky and ordinary paper.
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