THE ESSEX NATURALIST: BEING THE Journal of the Essex Field Club FOR 1889. NOTES ON AN ALLUVIAL DEPOSIT IN THE CANN VALLEY, WITH A LIST OF THE MOL- LUSCA OCCURRING THEREIN.1 By MILLER CHRISTY. With remarks by W. H. DALTON, F.G.S., late of the Geological Survey. [Read March 31st, 1883 ; Revised, December, 1888.] Among the more interesting of the geological features of Essex are the numerous fluviatile and lacustrine Post-glacial deposits, which usually contain plentiful remains of Mollusca, and generally some of Mammalia, as already described by various observers.2 I desire to record the existence of another of these deposits, which is in the Cann Valley, scarcely 100 yards from my own home, and which I have carefully investigated; but, as I am not a geologist, I shall confine myself almost exclusively to descriptive details. I have to thank various friends for much valuable information and assistance. Among these may especially be mentioned Mr. J. E. Clark, of York, and Mr. W. H. Dalton, of the Geological Survey, both of whom have inspected the deposit, and have given me their opinions concerning it, as well as other very acceptable aid. I have also received help through Mr. H. Corder, who sent samples of the various beds to Mr. H. B. Woodward, of the Geological Survey, con- cerning which the latter was kind enough to make some general remarks. The late Dr. J. Gwyn Jeffreys very kindly identified some 1 It should be mentioned that the publication of this paper has been delayed in consequence of Mr. Christy's absence from England and other causes. It has lately been revised, and the author and editor, not being geologists, have to thank Mr. Whitaker and Mr. W. H. Dalton for much useful advice and aid in connection therewith.—Ed. 2 The author quotes the titles of many of these papers, but they will all be found in Messrs. Whitaker & Dalton's geological bibliography of Essex in the present volume, to which the reader is referred.—Ed. B