. Geological magazine. posits of Sudbuky, Suffolk. By J. E. Marb, , ,Fellow of St. Johns College, Cambridge. THE accumulations of drift in the vicinity of the town of Sudburyhave been described by Mr. Whitaker in the Geological SurveyMemoir upon the part of Essex and part of Herts, etc.;and additional notes are given by the same author in the Memoir uponthe Geology of Ipswich, etc. Since the appearance of these memoirsthe sections have altered considerably, and one of the exposures isof such interest, that a record of it seems to me desirable, as in afew years it will be do
. Geological magazine. posits of Sudbuky, Suffolk. By J. E. Marb, , ,Fellow of St. Johns College, Cambridge. THE accumulations of drift in the vicinity of the town of Sudburyhave been described by Mr. Whitaker in the Geological SurveyMemoir upon the part of Essex and part of Herts, etc.;and additional notes are given by the same author in the Memoir uponthe Geology of Ipswich, etc. Since the appearance of these memoirsthe sections have altered considerably, and one of the exposures isof such interest, that a record of it seems to me desirable, as in afew years it will be doubtless destroyed, and one more link in thechain of facts which have to be considered in attempting to accountfor the mode of formation of these drifts will have disappeared. I wish to express my indebtedness to Dr. J. S. Holden, ,who has kindly accompanied me to the principal exposures, andfurnished me with much information. Fig. 1.—Section in Mr. Greens Pit of of Section about 100 feet. A. Chalk. 1. Boulder-clay. D. Gravel dug over and filled in. J5. Thanet Sands. 2. Gravel and sand. T. Talus. C. Bed Crag. 3. Loam. C Bed Crag caught up in drift. The section to which I would call special attention is seen inMr. Greens pit, about a quarter of a mile of Sudbury Town accompanying Figure (Fig. 1) shows its appearance at the J. E. Marr—Glacial Deposits, 263 present time (March, 1887). The Chalk, which is worked to adepth of many feet, is succeeded by the clayey green sand with green-coated flints, referred by Mr. Whitaker to the Thanet Sands. Thebed is partly removed at one point, near the north end of the section,but elsewhere it has its full thickness, which, is ascertained wherethe green sand is succeeded by an upper deposit resting conformablyupon it; this is the red clay, B^ of Fig. 2, which only occurs in onepart of the pit underneath a remarkable ridge of Eed Crag to benow described. The ridge is marked C in Fig. 1, and an enla
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