The Portsdown Anticline is a north-facing geological fold of Tertiary age affecting rocks in Hampshire, southern England.[1] This upfold of the local sedimentary rock sequence is paralleled by the Bere Forest/Chichester Syncline (downfold) about 2km to its north and a postulated deep fault to the north again. Further west, this major east-west structure adopts more of a NW - SE alignment.[2] At the surface the Portsdown Anticline is seen to affect the Chalk rocks of Late Cretaceous age at Ports Down though it is known to also affect the underlying Jurassic strata.[3]
^Toghill, P. 2000 The Geology of Britain: an introduction Crowood Press, Marlborough Wilts p166
^Melville, R.V. and Freshney, E.C. 1982 British Regional Geology: The Hampshire Basin and adjoining areas IGS/NERC, London p116 & 121
^British Geological Survey 1998 Fareham England and Wales sheet 316 Solid and drift geology. 1:50,000 (Keyworth, Nottingham: BGS)
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The PortsdownAnticline is a north-facing geological fold of Tertiary age affecting rocks in Hampshire, southern England. This upfold of the local sedimentary...
surface by an east–west upfold of the local strata known as the PortsdownAnticline. Southwick House is close by the north side of the hill, the HQ for...
eastern end under the Test Valley it is cut by the northward-swinging PortsdownAnticline. At the western end to the south-east of Salisbury the structure...
to the north are the Pewsey-Kingsclere Anticline and to the south the Dean Hill Anticline, PortsdownAnticline, Forest of Bere Syncline and Chichester...
northern edge of a small syncline separated from the main basin by the Portsdownanticline. The London Clay in this area, towards the top of the sequence, is...
for a fuller treatment of fold types and nomenclature but in brief, an anticline is an arch-like fold whereas a syncline is its converse; a downfold. Antiforms...
province it is divided in the following way (youngest/uppermost at top): Portsdown Chalk Formation (formerly part of 'Upper Chalk' and the equivalent of...
To the south are the broadly parallel Portsdown and Littlehampton anticlines, separated from the Wealden Anticline by the Chichester Syncline. The synclinal...
the south-east of Salisbury. An anticline to the north of Portsmouth results in the significant chalk ridge of Portsdown Hill within the younger sediments;...
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