The Craigballyharky complex, a plutonic intrusion associated with the Tyrone igneous series in Tyrone, Northern Ireland, consists of three major units--quartz diorite, tonalite, and biotite granodiorite--all containing ocellar hybrids, which, however, are most striking in the biotite granodiorite. These ocelli are basalt xenoliths metasomatically changed in a granitic magma. The petrography is described as the development is traced, and comparison with similar occurrences is noted.

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