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Published online by Cambridge University Press: 01 May 2009
The existence in Anglesey of a series of dykes later than most of the rocks of the island has long been known. Some of the more conspicuous ones were described by Henslow, many more appear on the map of the Geological Survey, and petrological descriptions were given some years ago (Geol. Mag., 1887–88) by Mr. Harker.
page 160 note 1 Some of my former colleagues of the Geological Survey, who have lately had much experience of the Red Rocks of South Wales and the Midlands, kindly examined some specimens for me.
page 161 note 1 It may be remarked in passing that the statements as to certain faults in the coalfield, if true, lose none of their importance as evidence.
page 162 note 1 Denudation along this soft friable material probably initiated the transverse ravine on the south side of the Holyhead Road at Holland Arms.
page 164 note 1 Some basic dykes recently described from the north of the island do not appear to belong to the same series. (See C. A. Matley, Abstract Proc. Geol. Soc., Jan. 10, 1900, and discussion.)
