^re^' ■YEM, r o V ip W:=';V,.wAv;y V.' ^^^W: ;HM^^S« 'SM "i/ U K^-' ^^^MumiM uT cc ^1 ym^mM BOUGHT WITH THE INCOME FROM THE SAGE ENDOWMENT FUND THE GIFT OF BH8HF 1S91 ENGiNEERfNG LIBRARY A.:Mk^.. , //A/./fZ^.... Cornell University Library QE 262.I6W57 1885 The geology of the country around Ipswic 3 1924 004 550 616 Cornell University Library The original of this book is in the Cornell University Library. There are no known copyright restrictions in the United States on the use of the text. http://www.archive.org/details/cu31 92400455061 6 MEMOIRS OF THE GEOLO&IOiL SURYEY. ENGLAND AND WALES. THE GEOLOGY OF THE COUNTRY AROUND IPSWICH, HAD LEIGH, and FELIXSTOW (EXPLANATION OF QUARTER-SHEEtS 48 N.W. AND N.E.) t BT W. "WHITAKEE, B.A., F.G.S, Assoc. Inst,. C.E., (With Notes by W. H. DALTON, F.G.S., and F. J. BENNETT, F.G.S.) PUBLISHED BT OBDEB OF THE LOKDS COMMISSIONEKS OF HER MAJESTt's TRBASUKT. LONDON"^ PRINTED FOR HER MAJESTY'S STATIONERY OFFICE, AtfD SOLD BT Longmans & Co., PaterDoster Bow ; Truenek & Co., Ludgate Hill ; Letts, Son, & Co., Limited, 33, Eng WiUiam Street ; -Edward Staneobd, 55, Charing Cross ; J. Wyld, 12, Charing Cross ; B. Qitabit'ch, 15, Piccadilly ; and T. J. Dat, Market Street, Manchester : ALSO BT Messrs. "W. and A. K. Johnston', Edinburgh ; HoDOES, Figgis, & Co., 104, Grafton Street, and Alexander Thom & Co., , Limited, Abhey Street, Dublin. 1885. Price Two Shillings. LIST OF GEOLOGICAL MAPS, SECTIONS, AND PUBLICATIONS OF THE GEOLOGICAL SURVEY. I The Maps are those of the Ordnance Survey, georoBioally coloured by the (Seologioal Survey of the "united Kingdom under the Superintendence of Aech. Geikib, LL.D., F.E.S., Director General. , ... ' ««• ^ s«. S0MERSBTSHIRE,-18, 19, 20, 21, 27, 35. Hor. Sect. 16, 16, 17, 20, 21, 22; and Vert. Sect. 12, 46, 47 48 49 50 51 STAEI'OEDSHIEE,-(54 NW), 55 (NE), 61 (NE, SE), 62, 63 (NW), 71 (SW), 72, 7S (NE, SB), 81 (SB SW) 'nnr Sect 18, 23, 24, 25, 41, 42, 45, 49, 54, 57, 51, 60; and Vert. Sect. 16, 17, 18, 19, 20, 21, 28. 26 '" SU]?POlX-47,* 48,* 49, 60, 61, 66 SB,* 67. SUEEEY,-1 (SWt), 6t, 7*, 8t, 12t. Hor. Sect. 74, 7b, 76, and 79. SUSSEX,— 1*, 6t, 6t, 8t, 9t, lit. Hor. Sect. 73, 75, 76, 77, 78. WARWICKSHIEB,-44*, 45 (NW), 53*, 54, 62 (NB, SW. SB), 6S (NW, SW, SB). Hor. Sect. 23, 48 to 51 82 83 ■ WILTSHIEE,^12*, 13*, 14, 16, 18, 19, 34*, and 35. Hor. Sect. 16 and 69. WOECBSTEESHIEE.-43 (NE), 44*, 54, 66, 62 (SW SB), 61 (SE), Hor. Sect. IS, 23, 25. 60. 59, and Vert. Sect. 16. CEBTEKAXa MEMOIRS OF THE CEOKOGICAK SmtVET. REPORT on CORNWALL, DEVON, and WEST SOMERSET. By Sir H. T. De Li Beche 14« (OP) PIwaRES and DESCEIPTIONS of the PALiEOZOIC FOSSILS in the above Counties.' By Pbop"phiixipb fO P * TheMBMOIESoftheGEOLOGICALSURVETofGRBATBRITAIN. Vol. I., 21s.- Vol II fin 2 P^ts) S. * ^°^7mZoti^L)^^^''' ^- ^•'^^'''^^- ^PP«'"i^'''yr-W-S"^=«andE.ETHEEii,GE. 2nd Ed. 21s. (VoLIuJ ^"'MeS&'oo'^^^^" ^^'■"* ^'^^^'^ *"'^^°''™«^«'l^ °^S. and W. Tracts. By W.WsiTAKEE. 13s. {Vol. IV. o Guide to the'GEOLO.GT of LONDON and the NEIGHBOURHOOD.. By W Whitaeer Mh bh i <, The WEALD (PARTS of the COUNTIES of KENT, SURREY, SUSSEX, and HANTS).* Bv W Topiev i». «., The TRLASSIC and PERMIAN ROCKS of the MIDLAND COUNTIES of ENGLAND Hv 15 irirfr TheEENLAND. By S. B. J. Skebtchit. 36s. 6(i. iv^ij^iii'. Jsy jj.utoe. 6». The MANUFACTURE of GUN FLINTS. By S. B. J. Skeetohit. 16s The SUPERFICIAL DEPOSITS of SOUTH-WEST LANCASHIRE. By C. B. Db Eakce 10s 6d MEMOIRS OF THE GEOLOGICAL STJRYEY. ENGLAND AND WALES. THE GEOLOGY OF THE OOUNTEY AROUND IPSWICH, HADLEIGH, and FELIXSTOW (EXPLANATION OF QUARTER-SHEETS 48 N.W, AND N.E.) BY W. WHITAKER, BA., F.G.S., Assoc, Inst. C.E., (With Notes by W. H. DALTON, P.G.S., and F. J. BENNETT, F.G.S.) PUBLISHED BT OBD£K OF THE LOltDB COMMISSIONliBS OF HEB MAJESTY B TBEASUHY. LONDON: PRINTED FOR HER MAJESTY'S STATIONERY OFFICE, AND SOLD BY LoMGJtANs & Co., Paternoster Row ; Tkubnbb & Co., Ludgate Hill ; Letts, Son, & Co., Limited, 33, King William Street ; Bdwaed Stanfoed, 55, Chaiing Cross ; J. Wyld, 12, Charing Cross; B, QuAEiTOH, 15, Piccadilly ; andT. J. Day, Market Street, Manchester : ALSO BY Messrs. W. and A. K. Johnston, Edinburgh ; HoDSES, Figgis, & jCo., 104, Grafton Street, and Alexandee Thom & Co., Limited, Abbey Street, Dublin. 1885. Price Two Shillings. NOTICE. The two Qoiarter-Sheets which are described in the present Memoir include the chief area occupied by the Red Orag of England. The most interesting and im- portant part of the Memoir, therefore, is that which deals with the Red Crag in Chapters IV., V., and VI. Some small tracts of the Coralline Crag are also included, but as the main district in which that subdivision of the Pliocene series is developed lies to the north of the area embraced by the present Memoir, the full account of the Coralline Crag will be given in the Memoir descriptive of Sheets 50 S.B. and 49 S. The whole of the Pliocene deposits of the East of England having now been com- pletely surveyed and published, it is intended to prepare a Stratigraphical Monograph illustrative of them. From the thickness and extent of the various Drift deposits, the areas occupied by the Crag and under- lying formations cannot be satisfactorily determined. The Crag is seen at intervals along the coast, capping the Eocene beds, also along the bottoms and slopes of the valleys in the interior. In similar situations the Lower Eocene clay and sand are laid bare below the Crag, while in two or three places the erosion of the main valleys has exposed the Chalk. Only one edition of the Maps, that showing the distribution of the super- ficial deposits, can therefore be published. Aeoh. Geikie, Director General. Geological Survey Office,, 6th March, 1885. E 1465 1. Wt. 4310. NOTICE; .As the. town of Ipswich is partly in Sheet 48.. N.W. of the Geological Survey Map, and partly in Sheet 48 N.E., it has been thought best to.,have a joint Memoir for the two maps, the chief town of Suffolk being then p!ractioally the central spot of the district described. Sheet 48 J!if.'W. was chiefly surveyed : by Mr. F. , J. Bennett ; but the survey of the southern (Essex) part was made by Mr, W. H. Dalton, and the eastern border by Mr. W- Whitaker. • Sheet '48 N.E, was chiefly mapped by Mr. Whitaker, the N.B. part however (beyond the 'rivers Finn and the Deben) is almost wholly the work of Mr. Daitdn. The whole was carried out under Mr. Whitaker's ^uperintendenpe ; and he has^alsp prepared this Memoir, jisingthQ notes of his colleagues (though the greater part is from his own notes), the tract mapped by him being thst't in which mqst of the chief sections occur. Both Maps were published in December 1882 ; the p,ric§,qf ,eacli is tljj;ee,;shill^ngs. ,. . ... , , The sma,ll part of Essex, in Sheet 48 N",E. (about 5 miles westward from Harwich) has been already de- scribed in the ,^hort Memoir, by Mr. Whitaker, on the tract to the soiith (4^ S.E,), to which therefore the reader is referred. :;. ^ H. W. Bristow, Geological Survey Office, Senior Director. March, 1885. CONTENTS. Page Notice by Director- G-eneral - - - - - - iii Notice by Director - - - - . ..iv Chap. I. Introduction. — Area. Elvers. (Jeological Formations. Shape of the Ground. By W. W. - - - . * 1 Chap. II. Cretaceous and Eocene (Lower London Tertiaries).— Chalk (Valley of the Stour. Valley of the Brett. Gipping Valley). Thanet Beds (Valley of the Brett. Valley of the Gipping). Beading Beds (Valley of the Stour. Valley of the Brett. Valley of the Gipping). Oldhaven Beds. By W: W. and F. J. B. - - - . - • - 5 Chap. III. Eocene and Pliocene. — London Clay (South of the Stour. North of the Stour, above the Brett. North of the Stour, below the Brett. Valley of the Orwell. Valley of the Deben). Coralline Crag (Tattingstone, Sutton, Bamsholt, Boyton Marshes). By W. W., W. H. D., and F. J. B. - - - 17 Chap. IV. Red Crag. — General Description (The Nodule Bed. Fossils. Bate of Deposit). Literature. By W. W. - - 29 Chap. V. Red Crag, continued. Details (South of the Stour, Essex. Between the Stouj* and the Brett. Valley of the Brett. Valley of the Stour, between the Brett and the Orwell. Valley of the Orwell, up the Eight Side. Valley of the Orwell, down the Left Side. Felixstow Cliffs and Pits.) By W. W., W. H. D., F. J. B. . -' U Chap. VI. Eed Crag, continued. Details (Valley of the Deben, up tjie Eight Side, to the Brightwell Valley. Brightwell Valley. Valley of the Deben, up the Eight Side, between the Brightwell and Finn Valleys. Valley of the Finn. Valley of the ,Deben, down the Left Side. Bawdsey Cliffs. Valley of the Ore.) By W. "W., and W. H. D. 68 Chap. VII. Glacial Drift.— General Eemarks. Gravel and Sand (South of the Stour, Essex. Valley of Stour, Left Side, above the Boxford Valley. Boxford" Valley. Valley 'of the Brett. Valley of the Stour and Tributaries, between the Brett and the Orwell. Valley of the Orwell, and Tributaries, Valley of the Deben, and Tributaries.) By W. W., W. H. D., F. J. B. - 72 Chap. VIII. Glacial Drift, continued.— Brickearth or Loam. (South of the Stour.Bssex. Between the Stour and the Orwell. East of the Orwell). Boulder Clay. (South of the Stour, Essex. Between the Stour and the Orwell. Between the Orwell and the Deben. East of the Deben.) By W. W., W. H. D., F. J. B. - - 83 A 2 VI Paob Chap. IX. Post Grlaoial Beds.— High Level Gravel. Kiver or Valley Drift. 1. Gravel (Valley of the Stour and Tributaries. Valley of the Orwell. Valley of the Deben). 2. Loam or Briokearth. List of Fossils from Stutton. Eecent Beds. 1. Alluvium. 2. Coast Deposits (Shingle, Blown Sand). By W. W., W.H.D-.andF. J.B. --.--- 92 Chap. X. Miscellaneous. — Disturbances. Economics (Building Materials, etc. Mineral Manures, Tvith Analyses of Phosphatic Nodules. -Watei^. By W. W. ■ '• - ■ -100 Appendix A.— Well-sections. 1. Essex. 2. Suffolk. By W. W. andE. J. B. - - - - - - - 106 Appendix B.— Borings. By W. W. - ' - - - 126 Appendix C. — Supplementary Notes to other Memoirs.--l-. Sections at Sudbury (Sheet 47). — 2. Analyses of Septaria from Col- chester (Sheet 4& S.W.). By W. W. and W. H. D. - - 132 Appendix D.— List of Works on the Geology and Palaeontology of Suffolk. By W. W. (and in part W. H. D.) - - - 134 Postscript. Well-section at Bradfleld . . - . 152 Index. ByW. W. . - - 153 PARTS BY THE VAB,IOUS AUTHORS. W. Whitakek, Pages 1-19, 21-70, 72, 73, 76-90, 92H56. W. H. Dalton, Pages 17, 18, 26-28, 44, 45, 67, 70, 71, 73, 82, 83, 87, 90- 92, 95, 98, 99, 109, 148-150. F. J. BenneM;, Page's 5, 6, 18-22, 45, 46, 73-78, 83, 84, 88, 92, 93, lil- 116, 120-122, 124. vu LIST OE ILLUSTRATIONS. Faoe Fig. 1.— Section in a Pit South-westward of Bramford Church. (W.W.) 7 ,, 2. — Section in Stoke Brickyard, Ipswich. (W- W.) - -11 „ 3.— Greneral Section at the Chalk Pit, nearly a mile North- ward, of Bramford Station. (W. W.) - - - 14 „ 4. — Cliff-Section on the Bight Bank of the Stonr, Wrabness. (W.W.) - . - - . . . .18 „ -6.— Section at Boxford Tile Kiln. (F. J. B.) - - - 19 „ 6.— Greneral Section at Aldham Brickyard. (F. J. B.) - 20 „ 7. — Section at Hadleigh • Brickyard, showing Disturbance. (W.W.) 21 „ 8. — Section of the Southern Side of the Brickyard at Whitton Leys. (W.W.) 24 ,, 9.— Section in Chalk Pit, Monks' Eleigh. (W.W.)- - ,45 * „ 10. — Section in a Pit at Park Farm, Tattingstohe. (Prestwich.) 47 ,, 11. — Section in a New Road-cutting, just N. of the Convalescent Home, Felixstowe. (S. V. Woor.) - - - 57 * „ 12.— Section in a Coprolite Pit by Foxhall Hall. (Wood.) ; 63 ^ " i/ >■ Sections in a Pit South of Martlesham. (Wood.) 65 * „ 15.- ■) * , , 16.^ \ Sections at Sutton. (Pkbstwich.) - - - 68 * „ 17— I * „ 18. — Section in Red Crag at Ramsholt. (Pkestwich.) - - 69 „ 19 Section in Drift at Cosford Union House. (F. J. B.) - 74 „ 20.— Section South of Semer Church. (F. J. B.) - . 75 „ 21.— Section East of Hadleigh Railway Station. (F. J. B.) - 75 „ 22.— Section ill a Grravel Pit near Hintlesham Priory. (P. J. B.) 77 „ 23.— Diagram-Section at Kirton Kiln. (W.W.) - - 86 ,, 24. — Section in- an old Pit westward of Lay ham Church. (W. W.) - - 88 ,, 25. — Section in the Cutting on the Pelixstow Railway, north- ward- of Albion Mills, Woodbridge Road, Ipswich. (W.W.) 89 „ 26.— Section on the Railway S,E. of Playford Hall. (W. W.) - 90 J, 27. — Plan of Borings at the S. End of Ipswich Dock - - 126 ,, 28.— Section in the Chalk Pit at Sudbniy Waterworks. (W.W.) 132 * These figures are from Quart. Joum. Geol. Soc, toIs. xxvii., xxxiii. THE GEOLOGY OF THE COUNTRY ABOUND IPSWICH, HADLEIGH, AND FELIX^STOW. GHAPTEIi I.— INTRODUCTION. ; -'• ^ Area. The two northern quarters of Sheet 48 of the Geological Survey Map represent an area of over 330 square miles, which consists chiefly of the extreme Southern part Of Suffolk (with the towns Hadleigh, Ipswich, Nayland, and the southern end of Woodbridge), but includes also the neighbouring border, .of Essex (Harwich and Manniogtree). This tract is wholly in the geological district known as the London Basin ; and comprises some 18 miles of coast, from a little south of Harwich to a little south of Orford (in Sheet 50, S.E.). A small part of this area, the neighbourhood of Harwich, has already been described in the Geological Survey Memoir, on 48, S.E.,* with which Map this particular part of 48, N.E. (S. of the Stour) is naturally joined. ElVBRS. The Stour, which is the county-boundary, runs through our district frpm La Marsh, on the west, to Harvyich, on the east, where it meets the Orwell, .the combined rivers then reaching the sea in about a mile. It is tidal to above Manniugtree and navigable throughout. The length of this river is 61| miles, and the area of its basin 420 square miles, its two chief tributaries having a combined length of 34 miles.f On the south the Stour receives only a set of small brooks ; but on the north it has the following tributaries : — 1. Below Bures the sinall stream rising near Assiti^on, from the Drift beds overlying - the London Clay. 2. The Boxferd River, starting in the Boulder Clay country of Little and Great Waldingfield and Groton, flowing south-east- ward, through the lower beds of the Drift, and the Eed Crag, and over the London Clay, and joining the Stour more than three miles * The Geology of the Eastern End of Essex (Walton Naze and Harwich). 1877. t Report from the Select Qomqiittee of the House of Lords on Conserrancy Boards, &c., 1877. 2 GEOLOGY OF IPSWICH, ETC below Nayland. 3. The Brett, which rises north of our district,* enters it westward of Monks' Eleigh, whence it flows, at first eastwaid, through Drift and occasionally Chalk, and then south- ward, through Drift and London Clay, with Red Crag between on the south, to the Stour at Higham, about half a mile below the Boxford stream. 4. The stream rising from the Drift north of Capel, with a branch from the Red Crag at Bentley, which joins the Stbur at Stutton New Mill. 5. The stream rising from Drift and Red Crag W.S.W. of Bel stead, and flowing thence south-eastward to the main river just below Stutton. The Orwell or Gipping. This river, known as the Gipping in its non-tidal part, above Ipswich, but as the Orwell in its tidal estuary, below that town,' rises north of our district,* through which it flows south-eastward from the north of Bramford to the sea at Harwich, just after receiving the Stour. On the right the Orwell is joined, just below Ipswich, by the stream rising in the Drift near Elmsett and flowing thence E.S.E. ; but on the left it has only very short streams. The Deben, which, rising to the north,* has its tidal estuary in our district, from Woodbridge S.S.E. to the sea at Bawdsey Haven. On the right it receives two tributaries : — 1. The Finn some 10 miles long, which, rising to-the north, enters our district at Tuddenham and flows eastward, through Drift, Red Crag and London Clay, to the Deben at Martlesham, 2. The brook that rises in tbfe Red Crag east of Ipswich and flows eastward through that bed to the London Clay, joining the Deben just below Hemley. On the left are only short streams, the brook from the Red Crag east of Sutton being the only notable one. The Ore or Aide reaches the coast at Aldborough, about four miles north of our district; but it is there turned southward by a bank of shingle, which, turning south-westward as it enters the N.E. corner of our district, continues some six miles further, dividing the river from the sea until just east of Hollesley. The Butley River, which rises a little north, joins the Ore about two miles above this. The short Hollesley brook discharges itself into Bowman's Creek, which, though now flowing, by one arm, direct to the sea, may be regarded as a tributary of the Ore, into the mouth of which its other arm flows. * See " The Geology of the Neighhourhood of Stowmarket," Geological Survey Memoir, 1881. intkoduction. 3 Gkologioal. Fokmatioms. The beds that occur at the surface in our district are shown in the following table, in which the right-band column gives the divisions that are shown by colour, etc. on the Greelogical Survey Map : — Becent -^ Blown Sand. Shingle. AUnvium. Valley Drift, f ^°*=' ^'^ Brickearth. Post.Glaoial.|.(j^^^3l_ J3.igh Level Gravel (of doubtful age). f Boulder Clay. I Grlacial Drift -i Gravel and Sand. [_Loam or Brickearth. Pliocene r Bed Crag. I Coralline Crag. Eocene "London Clay. Woolwich and Beading Beds, including a little of the Oldhaven Beds, above (Ipswich), and a little of the Thanot Beds, below. These three forming together the Lower London . Tertiaries. Cretaceous - Chalk. For a notice of the beds found beneath the Chalk in the boring at Harwich, see Memoir on Quarter-Sheet 48 S.E., p. 23. (1877.) This adds the following to the formations proved to Occur in our district, though not at the surface : — Cretaceous - { Sj^ '^'^^''''*'"^ '' Palaeozoic Lower Carboniferous. 4 GEOLOGY OF IPSWICH, ETC. The Chalk, whilst forming the basement-rock of the whole, and occurring as such throughout the district, and far beyond it on every side> is yet very rarely to be seen at the surface, in the bottom of some of the main valleys. The Reading Beds, too, crop out only to a slight extent in the same valleys ; btit the London Clay, though almost wholly confined in its outcrop to the valleys, plays a more important part in them, forming great part of their flanks. Were the district bared of Crag and Drift it would show, in its western half, a band of Chalk on the norths varying in width from about five miles to. nothing, followed by a com- paratively narrow belt of the Reading Beds ; whilst to the south, as well as over the whole of the eastern part of the district, there would be London Clay. The Coralline Crag, is a very local bed, and there are but three outer0{)8 of it. Thfe Red Crag, on the other hand, occurs over a large part of the district, generally with a narrow outcrop at the higher part of the valley-flanks. The various beds of Glacial Drift occur over nearly the whole of the area ; indeed it is for the most part in the valleys only that other beds are to be seen, whether those -underlying ones already noted, or those newer deposits which are essentially of vaUey-formation The shore accumulation of shingle is well represented, especially on. the north-east. Shape op the Ground. The physical features of the district are simple. We have to deal with part of a low, wide-spread plateau of Glacial Drift (from about. 50 to 200 feet above the. sea), which was once con- tinuous, but is now more or less divided by the valleys that have been cut through it. On the west and north-west this plateau is formed by the Boulder Clay ; whilst in the other parts, which on the whole are at a lower level, the underlying gravel and sand form the flat tops of the low hills, W. W. CHAPTER II.— CRETACEOUS AND EOCENE (LOWER LONDON TERTIARIES). Chalk. We have only to do with the top part of the Upper Chalk. Of the formation as a whole, it is enough to say that at Harwich its thickness has been proved to be 890 feet. Valley of the Siour, In the valley southward of Chilton Church, at the western edge of the map, there is a small outcrops^the easterly? end of that at Sudbury, already described in the G-eological Survey Memoir on Sheet 47.* Brett Valley. ,, At Monks' Meigh there is a small outcrop,, and the Chalk is shown in section beneath Crag and Drift (see Pig. 9, p. 45). ' " "W. W. At Ohelsworth is another outcrop, with a large old pit, marked on the Map, about half-mile S.E. of the church. This pit is now ahnost aban- doned and overgrown, showing' only al>out 12 feet of soft jointed bedded chalk, with very few flints. To the north-east, across the stream, is another ^it, also almost abandoned, between the road and the windmill. There is a very small exposure along an old river-cliff about half-a-mile N.B. of Oosford Bridge, with a pit (see p. 6), and, at Kersey Mill, just below, is another, also in ariver-oliflF, at the base of which the Chalk is just visible, whilst, it can be clearly seen in the bed of the mill-stream. I'- J- B. Valley of the Gipping. The outcrop of the Chalk along this valley in the tract just to the north (50 S.W.) continues for about half-a-mile into our district on the right side, and about a mile on the left, to near Bramford Station. At the old chalk-pit, marked on the Map, about 1| miles N.N.W. of Bramford Church, there is some gravel, and apparently some Boulder Clay, over the Chalk. At one spot there was a black mass in the Chalk, tending to go off into a thin layer, and at another (freshly cut) there was a black smudging, chiefly along two irregular layers of chalk. This, perhaps due to manganese, is like what has been noticed in a neighbouring pit, in 50 S.W-t .On'the left side of the river there are good exposures in the two large pits described at pp. 14, 15, and the Chalk is also shown in the large old overgrown pit in the wood to the south, and in the small pit eastward of Bramford Station (see p. 88). South of Bramford the Chalk has a very narrow outcrop along the steep bank on the left side (Hazel Wood, see p. 6). At the northern part of the wood is a large old pit, quite overgrown and hidden, where Chalk was probably got, at the bottom at all events : at the top there is gravel. On the south of Ipswich the Chalk seems to have been brought up, by a disturbance of the beds, near or to the surface. It is shown in an old pit on the southern side of the farm, about a quarter of a mile 8. of Stoke Eeetory, and on the southern" side of the side-stream, justW. of the Ostrich Inn, it seems also to have been found^ judging by the occurrence of green-coated flints (from the base of the Tertiary beds) on the site of a pit, now ploughed over. * The Geology of the N.W. Part of Essex and the N.E. Part of Herts, with Parts of Camhridgesliire and Suffolk. 1878. f The Geology of the Neighbourhpod of Sto-vrmarket^ p. 4. Geological Survey Memoir, 1881. GEOLOGY O* IPSWIOH, ETC. Thanet Beds. The occurrence of the lowest division of the Lower London Tertiaries at the western border of Suffolk has already been noticed in a Geological Survey Memoir,* and from the district therein described the division seems to reach eastward to Ipswich, where, however, it is thinner than at Sudbury, being represented only by the clayey greenish bed that forms its, base. It is, of course, far too thin to be mappable, and therefore, as in Sheet 47, has been included with the Reading Beds. Valky of the Brett. The clayey base-bed was shown in a pit less than a quarter of a mile south of Semer Church (see pv 75). W. W. At the old chalk-pit, marked on the Ma^p, about half-a-mile north- eastward of Cosford Bridge, the following section was seen : — Boulder Glay, at one part. - Pinkish clayey sand, firm, bedded, passing into the bed below. Dark green clayey sand. A foot. Thanet Beds -i I^gl»*-grey clayey sand, with green grains, blooky and _ ^ jointed, the interstices filled with a white incrustation, forming in one place a hard calcareous nodule. 4i feet. Layer of greea-coated flints. Chalk, rather hard, with few flints. Slight dip to S.E. At Kersey Mill a like section was shown in the river-cliff, the beds being as follows: — Boulder Clay, in part, cutting across the next two beds. Beading Beds. — ^A wedge-shaped piece of green gand. rFine buff bedded clayey sand, firm, blocky and jointed. Thanet Beds -< '^^^ bottom part pinkish and passing into the bed I below. 6 feet. L Rather clayey bedded green sand. The junction with the Chalk was hidden by talus. F. J. B. Valley of the Gipping. North of Bogers-field Grove, at the very edge of the map, there seems to be a trace of the base-bed, between" the Drift sand and the Chalk. , ^ At the two large pits northward of Bramford Station the layers of green sand and grey clay next above the Chalk may belong to the Thanet Beds (s^e p. 14). In the ditch running westward from the western corner of Hazel Wood, south of Bramford, and close to the marsh, there was at the bottom some very challgr clay {? reconstructed or decomposed Chalk) and some clayey green sand (of the base-bed) mixed up ; showing the proximity of the junc- " tion of the Thanet Beds and the ChaU:. Just within the wood is an old overgrown chalk-pit, with a little clay at top in parts. * The deology of the K.W. Fart of Essex, etc. (Sheet 47), pp. 12, 15-17. (1«78). 00 B B s B 'a B G'o ^i 9 "-^ t^ ^o ±.0 ■a -a w f^ 3 \^ rCrS " S € ^ ■? w p *rf ,0 0< 3 is b O 3 O -2 S 0.2 3 ■ O c» V 9; S--v* ■3 .a ^3 c ™ & H g o ja •s s "Sal £§ g* ^ =i 3 o-rS^^rS-a *" ° 3 .--^ -e S S ^ "l-S 3 -S ^ ^ S '2 _r Rl S S n_ O "^ ' s S ^ ?-, s S 5=1, f- J4 S S ™" 3 ■-"1 0!2 =1 6 8 GEOLOGY OF IPSWICH, ETC. A pit about half a mile to the south east gives the clearest section of the Thanet Beds in this neighbourhood (Kg. 1), showing the thin reddish bed that occurs so universally above the green sand around Sudbury (Sheet 47). The evenness with which both the Boulder Clay comes on above the Thanet base-bed, and the latter above the Chalk is noteworthy. • In the Ipswich Museum there are some oasts of shells (a large Nueula, Oa/rdimn, &c.) which Dr. J. E. Taylok told me that he had found in this pit, and which he thought might have come from the Beading Becls. This, however, is unlikely, though they might belong to the basement-bed of the Loudon Clay; but as no other part than the very base of the Eocene series is to be seen in the pit, I arrl inclined to think that the specimens must have come from some transported mass. Reading Beds. Although but little seeb at the surface, by reason of the wide spread of Drift, there can be no doutt of the universal presence of this Varying set of sands and clays beneath the London day, as may be inferred from the sections of wells sunk through the last (see Appendix A). In thickness the Keading Beds, as- we may call them, the shelly Woolwich conditions being absent in our district, seem to vary from about 20 to 50 feet ; but it is doubtful in most cases whether the clayey green sand at the base may not rather belong to the Thanet Beds. , In Phof. Pkestwich's paper on this Series,* which gives so full an account of other districts, very little is said of Suffolk (pp. 92, 93), the author clearly not having seen such good sections as were open to us. The statement that "it appears that the space of 30 or 40 feet between the London clay and the chalk is occupied by sands only," will be seen not to hold good, as the characteristic mottled plastic clays dso occur. It will be convenient in describing the sections to work from west to east. Valfey of the Stour. On the left bant of the Stour there is afa outcrop south of Chilton ; but the bottom of the series i^ hidden by the deposit of loam and giTivel in the lower part of the valley. The outcrop seems to begin near Kiln Farm, and thence runs north-westward along the flank of the valley for about a milef. ' . At the pottery nearly a mile east of south from Chilton Church the pit jiist by the kiln (western and lower edge of the yard), gave the following section (1873) :— Feet. Surface- earth, loam, &c. , - - . .." - up to 3 Drift. Kne soft brownish rather clayey sand, with layers of clay - - - - - - - -iiptoS London Clay, bluish when: freshly cut but getting darker and brown by weathering, with vertical cracks in part, causing it to split oflf in great irregularly columnar masses. No basement- bed - ■ - - - - - up to 8 * Quart. Journ. Oeol. Soc., vol. x., p. 75. t See also the Memoir on Sheet 47. (1878.) Heading Beds. LQWEK LONDON TERTIIAKIES. 9 Feet. 'Sharp loose light-coloured sand . . -froni to over 1 Dark grey firm fine sand, dompaoted, passing into '. the next .... from .0 to nearly 1 Dark grey sandy clay, partly ironshot, passing into the next - . - - - - 1 or more Pale greenish fine sandy cl^iy-and clayey sand, ' mottled with red at the bottom part - , - 3 or 4 Pale greenish and light coloured fine sand, with two marked layers of pipe-day, shown to over 4 The top bed of the Reading Series passes over the second one and then rests on the third, soon, however, ending ofi", when the London Clay rests on the last. A pit just north of the comer of the road north-west of the Pottery gave the following section (1873), partly derived from information, the lower part not being visible: — Coarse bright-coloured sand, with a little ironstone ; the upper part rather clayey, the lower false-bedded ; about 10 feet. Though mapped with the Drift this very likely belongs to the Crag. . London Clay, the top 3 feet clean, the rest with "malms" (=race), about 10 feet. Beading f Sharp sand, nearly white, 3 feet (=the 1 foot bed at the Beds 1 pottery). . - ' ' L Reddish play ?aid to occur below. IVom this short outcrop, at the western edge of our district, the Beading Beds are not again seen for more than seven miles. We will, however, leave the northern outcrop to notice a small isolated protrusion of this series, due to local disturbance, at a still more unexpected place than Shelly (noted below). The low cliff' of the Stour froni nearly half a mile below Stutton Mill eastward is overgrown and tumbled. At first there is some gravel, but this soon ends, and then London Clay n^ay be seen, sandy^and like base- ment-bed at the bottom in parts. A trifle further, in the very slight hollow in the shore due south of Stutton Hall, there was (in 1872) at the bottom, in a tumbled mass, some reddish mottled clay, like the plastic clay of the Reading Beds, and close by fine light-coloured sand, with some pieces pf sandstone, occurs beneath thip clay. (A block of grey wether- sandstone and some smaller pieces that were lying about may have come from this.) At the top was a little gravel, but nowhere any clear section. The sandy London Clay comes on again directly, so that there would seem to be merely a very small (unmappable) boss of the beds below. Valley of the Brett On the right bank of the valley there seems to be an outcrop from Semer to Kersey (up the side-valley) and also jip the next side- valley to Kersey Hole. . ^ " A mere trace has been noted at Kersey Mill, on the left bank of the Brett (see p. 6). Just north-eastward of Hadleigh there is a narrow outcrop along a side- valley, and at the brickyard nearly three