In preparing a new edition of the Memoir it seemed desirable to collect information about the Mines of the limestone-area, concerning which little was said in the first edition. With the view of in some measure supplying this omission, Mr. Strahan visited the district, inserting the lodes on the six-inch maps, and drawing a fresh base-line for the Millstone Grit in the few districts where this was necessary, the "Yoredale Grit " having previously only been mapped where it was well developed. The following statement gives a summary of the chief alterations made in this edition of the Memoir : Chap. I. remains about the same as in the first edition. Chap. II. has been re-written by Prof. Green. It deals with the change in the classification of the Millstone Grit and Yoredale Rocks. Chaps. III. and IV. remain the same, except that the mining information has been removed to the later chapters of the book. Chaps. V., VI., and VII., describing in detail the Millstone Grit and Yoredale Rocks, have been re-arranged, and in part re-written by Professor Green, and the information upon the Coal Measures (now given in the Memoir on the Yorkshire Coal-field) cut out. Chap. VIII. The portion dealing with the Drift has been largely added to by Prof. Green, and a map (Fig. 25) showing the glaciation of the N.W. of England has been drawn by him. The notice of the caves and of the bones of extinct animals, is in great part new, and has been written by Mr. Strahan. Chap. IX. The account of landslips has been added to, and a notice of the warm springs, and ebbing and flowing wells inserted by Mr. Strahan. Chaps. X., XI., XII., dealing with the mining, are entirely new, excepting the accounts of the High Rake Mines (pp. 133, 134), the Milldam Mine (pp. 135, 136), the Millclose Mine (p. 147), the Crich Mines (p. 155), and the Blue John Mine (p. 162), which have been transferred from the first edition. The remainder was written by Mr. Strahan. Appendix I., a list of the Carboniferous Limestone fossils, has been revised and very largely added to by Messrs. Sharman and Newton. Appendix II., a bibliographical list by Mr. Whitaker, is new; only a few publications having been noticed in the first edition. The revision and re-arrangement of those parts of the first edition which are retained here, and some additions specified in the preceding detailed statement, are the work of Professor Green; he has, moreover, read the proofs of the whole Memoir, and numerous improvements are the result of his suggestions and additions. Dr. Foster has, also, read the proofs of the parts which relate to mining. Mr. Strahan, however, is responsible for the parts contributed by himself, for the Index, and for the editing of the Memoir generally. Geological Survey Office, H. W. BRISTOW, Senior Director. 28, Jermyn Street, London, S.W., PREFACE TO FIRST EDITION, 1868. WE will here state the share of each of the authors of this Memoir in the mapping and description of the country, and acknowledge the assistance received during the progress of the work. In 1864 the greater part of Quarter-sheet 81 N.E. was resurveyed by Messrs. Green and Foster; a small part in the south-east corner being the work of Mr. Dakyns, who joined them towards the end of the year. In 1865 Mr. Dakyns carried on the work by Chatsworth and Ashover down to Crich, and also mapped the neighbourhood of Stanton; while Mr. Green took in hand the district between Stoney Middleton and Rowsley, and the Lower Carboniferous Rocks in 82 N.W., assisted in the case of the latter by Mr. J. C. Ward. The work was delayed by matters of more pressing importance during 1866, but in the early part of 1867 Mr. Dakyns completed the survey of the Millstone Grit from the neighbourhood of Crich southwards, and Mr. Green examined the country between Belper and Ashbourne, and the greater part of the Limestone boundary. Each author describes in the Memoir the portions of the country surveyed by himself, with the exception of Dr. Le Neve Foster, who left the Survey at the beginning of 1865. The copious notes and illustrations, however, which our former colleague left behind him, have been largely made use of, and entitle him to the right of a place on the title page. The general arrangement of the Memoir was entrusted to Mr. Green. It has not happened that we have had to apply for information and assistance in many cases, but we have great pleasure in mentioning that, wherever this has been the case, we have met with the utmost readiness to comply with our request. Mr. R. H. Ashton of Castleton, Mr. B. Bagshaw of Foolow, and Mr. Maltby of Eyam, gave us access to the mining plans in their offices; and Mr. W. C. Moore of Bamford, and Mr. E. W. Wass of Matlock, allowed us to visit their mines. We have also to thank for information, embodied in the following pages, and unless from unintentional oversight acknowledged in each case in the place where it occurs, the following gentlemen: Mr. Cottingham, agent to the Duke of Devonshire: Mr. J. Allport, general manager, and Mr. W. H. Barlow, engineer, to the Midland Railway Company; Mr. Binney, and Mr. Wardle of Leek, both old friends of the Survey; Mr. Sorby, and Mr. Mitchell Withers, of Sheffield; Mr. John Ward of Longton; and Mr. Young and Mr. Taylor of Oughtibridge. We believe this completes the list; but if there are any whose names have slipped from our memory, we beg leave to assure them with every apology that the omission is accidental, and hope that for this and all other shortcomings in the work we shall be dealt with as leniently as possible. Geological Survey Office, 28 Jermyn St., London, S.W., 1868. |