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The Upper chalk of Enland and its Zones

Nature volume 70, pages 286287 (21 July 1904) | Download Citation



WE have received two important contributions to our knowledge pf the Upper Chalk in this country. The one on “The Upper Chalk of England” is the third and concluding volume of Mr. Jukes-Browne's memoir on the? Cretaceous rocks of Britain, issued by the Geological Survey (price 10S.). It is a goodly volume of 566 pages, in which the stratigraphical features of the Upper Chalk and the fossils of the successive zones are very fully dealt with. As in previous volumes, Mr. William Hill has contributed particulars of the microscopic structure of the Chalk. The ample topographical and palæontological descriptions of the Chalk will enable the student readily to ascertain what is known, and the author has been fortunate in being able to embody the results of a great part of the recent work accomplished by Dr. Rowe. In one chapter he discusses. the bathymetrical conditions during the formation of the Upper Chalk, pointing to facts presented by the Chalk rockbeds which indicate a general upheaval of the British area. Later on, during the period of the Micraster and Marsupite zones, evidence of subsidence is afforded, and this was probably succeeded by re-elevation during the time of the Belemnitella zone. This volume contains a general account of the economic products of the Chalk, including water-supply, and reference is made to the bournes or nailbournes, notable examples of which, as at Croydon and elsewhere, have recently manifested themselves. The Chalk escarpments and other features of Chalk districts are described. There is also a general list of all the known fossils-from the Chalk of England, with references to zones and localities, and there is a full bibliography. Mr. Jukes-Browne is to be congratulated on the completion of this exhaustive work. We only wish that it had been some what better illustrated.

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