VOL. xvii. (I) INFERIOR OOLITE-SOUTH COTTESWOLDS 89 



At the Monkswood Reservoir, however, Mr Winwood ob- 

 served the Upper Trigonia-Gvit resting directly upon blue clay, 

 from which a specimen oi Ammonites cafricornus was obtamed. 

 This phenomenon again may be due to slipping ; but, if not, it 

 opens up some very interesting questions in connection with 

 the relations of the Cotteswold-Hills and Dundry-Hill areas of 

 sedimentation in late Liassic times. 



The Upper Trigonia-Gvit is of the usual aspect, but in 

 -places shows evidence of having been worked up again after its 

 original deposition, possibly by an erosion following the crust- 

 pressures that governed the limits of the area over which the 

 Dundry Freestone was laid down. 



(1) The Upper Trigonia-GTit has been exposed at Hill House, to the 

 ^ north-west of Box (where it can form but a very small 



outlier) :' 



(2) At the Monkswood Reservoir : ■ ^ ^ .. T^™»,r'= 



(3) In the Woolley-Langridge Valley at Turner s Court, or Tomey s- 



court," as it is now called : 



(4) At Charlcombe : and ,^ ^^ , ^ v y^t-^,, 



(5) In a road-cutting just after leaving North Stoke for Kelston. 



In the quarry at Tomeyscourt the rock is much disturbed, 

 and comprises white, oohtic, seldom-fossiUferous limestones at 

 the top (Doulting Beds) ; and brown, slightly-ironshot lime- 

 stones below, which yielded the following fossils that are 

 indicative of deposits of Garantiance and Truellei hemerse ; 

 Acanthothyris spinosa (Schlotheim) , Acanthothyris, sp. nov., 

 Zeilleria Hughesi (Walker), Ctenostreon fectiniforme (Schloth.), 

 Lithophagus indusus (Phillips), Trigonia costata. Sow., Ostrea, 

 sp., Myoconcha (internal cast), and corals {Isastrcsa). 



' In the Kelston-Road Section (5) the Upper Trigonia-Gvit 

 has a thin layer of corals on top of it, and separating it from 

 the succeeding Doulting Stone. 



The Doulting Beds were formerly exposed in a number 

 of quarries in this part of the Bath District, for example. " at 

 the northern end of Beacon Hill, near Charlcombe" ; " south- 

 west of Gwenfield Farm," and again at Primrose Hill ; but are 

 now best seen at Slade's Farm, Ditteridge, and in a deep 

 water-course at Charlcombe, where is the section that was 

 described by Sir William V. Guise. The Upper Trigonia-Gvit 

 here is 4 or 5 feet thick.^ 



I " The Jurassic Rocks of Britain," etc., vol. iv. (1894), p. 98. When I visited the locality in 

 1905, extensive drain-excavations revealed blue clays between the farm and the road to the north. 

 No fossUs were found in the clays. 2 Proc. Cotteswold Nat. F.C., vol. u. (1865), pp. 171-172- 



