The water supply of Oxfordshire, with records of sinkings and borings / by R.H. Tiddeman ... with contributions on rainfall by Hugh Robert Mill ... Pub. by order of the lords commissioners of His Majesty's Treasury.

  • Tiddeman, R. H. (Richard Hill)
Date:
1910
Catalogue details

Licence: In copyright

Credit: The water supply of Oxfordshire, with records of sinkings and borings / by R.H. Tiddeman ... with contributions on rainfall by Hugh Robert Mill ... Pub. by order of the lords commissioners of His Majesty's Treasury. Source: Wellcome Collection.

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    The following table shows in descending order the geological formations which come to the surface in Oxfordshire :— Alluvium. Brickeartb. Valley Gravel. Plateau Gravel. ( Loudon Clay. \ Reading Beds, r Upper Chalk. Middle Chalk. Chalk Marl or Lower Chalk, j Upper Greensand, i. Gault Clay, f Lower Greensand. ( Shotover liands. Purbeck Beds (clays). Portland Beds (limestones, sands and clay). Kimmeridge Clay. I Coral Rag and Oolite ) Basing into Recent and Pleistocene. Tertiary. Upper Cretaceous. Lower Cretaceous. Upper Oolitic. Middle Oolitic. Corallian Beds ^ Calcareous grit and sands } Ampthill Clay. Oxford Clay and Kellaways Beds (sands and clay). Cornbrash (limestone). Forest Marble (clay and limestone). Great Oolite (white limestone, oolite and marl, with Upper I Estuarine Series containing sandstone). Inferior Oolite (limestone). Upper Liassic (clay). Middle Liassic (“Marlstone” Series). Lower Liassic (clay and limestone). The colour-printed Oxford map, issued in 1908, shows tlie distribution of the river-gravels and jjlateau-drift in the country around Oxford. Lower Oolitic. Liassic. LIAS. The Liassic areas in Oxfordshire lie in the northern part of the county, the princi])al tract being around Banbury, to the west of which it is overlain by^ faulted outliers of Oolitic rocks. Iidying exposures, where streams have cut down to Lias, occur east of Chipping Norton, and several strips of Lias extending from the main outcro[) are exposed from the same cause. Thus Lias extends in the Cherwell valley from the Banbury area as far south as near Tackley, from Kingham along the Even lode valley by Shipton to Charlbury, and from Windrush by the valley of that name to beyond Burford. The U]iper Lias consists mostly of clay with ferruginous con- cretions. At Fawler, in the Evenlode valley, it showed a thickness of only 16 feet. At Kingham it was 50 feet thick, and at Bloxham and Banbury 60 feet.* The Mickleton boring in (Tloucestershire, some 9 miles west of the county boundary, is of importance as showing the greatest thickness found in this region. The items were :— ft. Upper Lias ... ... ... ... 120 estimated. Middle Lias ... ... ... ... 280 bored. Jjower Lias ... ... ... ... 961 bored. 1361 * 11. B. Woodward, “Jurassic Rocks of Britain ’ (Mem. (Jcol. Survey)^ vol. hi., 1893, p. 268.