Within Colin Glen there are a number of rock exposures that are of geological interest. The series of rocks in Colin Glen forms a complete succession of rock types which stretches from the Triassic Period (225 million years ago) to the Tertiary Period (65 million years ago).
The rocks in Colin Glen form a succession through time and from the type of rocks and fossils found we can find clues to the nature of past environments in the Glen. The Geology within the Glen is unique in Northern Ireland as it has outcrops of all the rocks in the Belfast Hills area.
Because of the importance of the Glen's Geology, visitors (such as the Belfast Naturalists Field Club) have been coming to the area for over 100 years, at a time when geology was still in its infancy as a science. http://www.colinglentrust.org/forest-park/wildlife/
The cache only has room for a logbook.