Anjouan is an extinct volcanic island, part of the Comores
archipelago.
Lavas of the shield-building stage comprise ankaramites, oceanites
and olivine basalts, with minor development of hawaiites and trachytes.
Younger lavas consist of basanites and a significant proportion
of derivatives following a trend towards phonolite (Flower, 1972) .
The rocks are dated between 0.1 and 1.522 million years.
The following stamps were issued in 1950.
The following stamp was issued in 1971.
The following stamp was issued in 1972.
As were the following two stamps.
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