Page:Transactions of the Geological Society, 1st series, vol. 3.djvu/350

 The western extremity, which I did not measure, judging from its appearance at a distance, can be very little less than this height.

The Quantock hills when viewed from a distance, present a gently undulating outline, which rises in three places into a more prominent elevation, the most northern being called Doucebury, the central height Will's Neck, and the most southern Cothelstone Lodge, from which last point the range diverges, as has been already noticed. Will's Neck is the highest of the three, and was measured at the time of the Trigonometrical Survey, and found to be 1270 feet above low water. It is called in the Survey the Bagborough station, being immediately above the village of that name. Doucebury I found by the barometer to be 1022 feet, and Cothelstone Lodge 1060 feet above low water mark; but as both these measurements were made under very unfavourable circumstances, they are not to be relied on. Doucebury must be considerably higher than I found it to be; the measurement of Cothelstone Lodge is probably not very far from the truth, judging in both cases from the comparison between the three heights when seen at a distance.

§ 4. The whole of the mountainous part of this district is formed of a series of rocks differing very considerably in mineralogical characters, but which the repeated alternations of the several varieties, and the insensible gradations that may frequently be traced of one into another connect into one common formation. A great proportion of these have the structure of sandstones, the component parts varying in size from that of mustard seed to such a degree of fineness, that the particles can with difficulty be discerned. Quartz and clay are the essential component parts of all the varieties, but in different proportions. The quartz in some