The Po Pin Chau tuff occupies the eastern part of Hong Kong
and some offshore islands.
These were emplaced about 140 million years ago during the
The following stamp depicts part of the coastline and a close-up
of columnar structure.
The stamp was issued in 2002.
Thermography, has been applied to this set of stamps during
the printing process.
This involves putting a layer of transparent thermographic
powder to the stamp sheet before the ink dries.
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