Some Igneous Rocks in North Pembrokeshire

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Abstract
The acid rocks which form the subject of the bulk of the following notes are situated at the eastern end of the Prescelly Hills in North Pembrokeshire. Although igneous rocks differing from these do occur to a large extent, their petrological interest is not great, and the mention made of them will be brief. The Prescelly range has a general trend in an easterly and westerly direction, and may be considered as extending roughly from near the village of Rosebush—noteworthy for its slate-quarries—to the village of Crymmych, some 7 miles to the west. The slates of the country are coloured on the Geological Survey maps as Llandeilo; and it is unfortunate that the difficulty of finding fossils prevents much further and more definite information being added. Although apparently organisms are sometimes found in the Rosebush slate-quarries, neither my endeavours nor those of the men employed in the place Were successful during my visit. About 1¼ mile west of Crymmych, however, a few fragmentary fossils were obtained.

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