276 DE. C. A. MATLEY ON THE [June I9I2, 



Although the dug well is stated to be in ' red marl ' for its 

 whole depth, some drift is no doubt present in its upper part. 

 The ' loose red sandstone ' found in the lowest part of the boring 

 may possibly belong to the Upper Bunter. The section may 

 accordingly be summarized as under: — 



Thickness in feet inches. 

 Keuper Marls (including some drift) ... 478 



Lower Keviper Sandstone 209 



Upper Bunter Sandstone (?) 40 



Total 727 



The intercalation of marls in the Lower Keuper Sandstone 

 practically throughout its thickness is very striking. The great 

 variation of the Keuper deposits in all the borings is quite evident. 



X. Summary. 



The results set forth in this paper may be summarized as 

 under : — 



(1) The Arden Sandstone Group of Warwickshire forms a band 

 in the Keuper Marls about 120 to 160 feet below the Rheetic beds. 

 It consists of sandstone, marl, and shales in varying proportions, is 

 typically 20 to 2b feet thick, but often much thinner, especially in 

 the south-east. 



(2) It is thrown into numerous shallow folds having north-west 

 to south-east and north-to-south axes, and is tilted as a whole 

 south-eastwards. 



(3) From its nature and fossils, and from a consideration of 

 similar rocks in the Keuper Marls between Gloucestershire and 

 "Worcestershire, it appears probable that the Arden Sandstone 

 Group was laid down over an area at least 70 miles in length, and 

 was formed as an episode in the history of the Keuper Marls, by 

 an irruption of the sea into the Keuper-Marl area. 



(4) Particulars are given of three well-borings going down into 

 the Lower Keuper Sandstone. 



XI. BiBLIOGEAPHT. 



The following works refer to the Upper Keuper Sandstone of 

 Warwickshire : — 



Beaslet, H. C. (98). — ' Notes on Examples of Footprints, &c. from the Trias 

 in some Provincial Museums ' Proc, Liverpool Geol. Soc. vol. viii (1898- 

 1900) p. 233. 



British Association Reports. — ' Investigation of the Fauna & Flora of the 

 Trias of the British Isles '—Reports of the Committee, 1903-1909. First 

 Report (Southport,03) pp. 219-30; Second Report (Cambridge, 04) pp. 275- 

 88; Third Report (South Africa, 05) pp. 161-70; Fourth Report (York, 

 06) pp. 293-301 ; Fifth Report (Leicester, 07) pp. 298-313 ; Sixth Report 

 (Dublin, 08) pp. 269-82 ; Seventh Report (Winnipeg, 09) pp. 150-63. 



Brodie, p. B. (56). — 'On the Upper Keuper Sandstone (included in the New Red 

 Marl) of Warwickshire ' Q. J. G. S. vol. xii (1856) pp. 374^76. 



