The Lower Palæzoic Rocks of the Neighbourhood of Haverfordwest

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Abstract
§ 1. Introductory. The country around Haverfordwest is of great interest to geologists, first, on account of the evidence furnished therein of the relations of the graptolite-bearing beds to the strata which are characterized by the presence of higher organisms, and secondly, from the nature of the foldings which the rocks of the district have undergone. We propose, in this communication, to devote our attention to the former of these subjects. Our work is based upon that which has been done by the Geological Survey, and published in Sheet 40, Horizontal Sections, Nos. 1 & 2, and Mem. Geol. Survey, vol. ii. part i. Whilst fully acknowledging the great value of these publications, we think it desirable, now that our knowledge of the forms of life occurring in these rocks has been so much increased by the labours of many geologists in recent years, to attempt a more minute classification of the rocks of this district than that adopted by the Government Surveyors. In our opinion, this further description of the beds will throw considerable fight upon the character of the movements which the district has undergone. Our thanks are due to Dr. Hicks for the very kind way in which he placed a series of specimens collected by himself at our disposal. We have also to thank Prof. Lapworth for his kindness in examining our collection of graptolites. The area which we have chiefly examined is a well-defined tract (see Map, Pl. XV. fig. 1), about eighteen miles in

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