Notices of Memoirs — Dr. Irving on a Sarsen Stone. 33 



Rugby), Long Itchington, Harbury, and Upper Goldicot, nearEttington 

 (near Stratford). 



Mr. H. B. Woodward is the only author who has recorded any 

 details of the Church-Lawford section.^ He observed the Cidaris- 

 Shales resting upon "greenish-grey marl, 5 to 8 feet " thick, and 

 these in turn upon the red and green marls of the Keuper. He stated 

 that it is noteworthy that the Pifer?'«-cow^or^«- Shales "are not repre- 

 sented at this locality", and elsewhere adds '^ "nor in the Rugby 

 well, and they are poorly represented in other parts of Warwickshire". 



J. M. AVilson recorded the details of the well-sinking^ referred to 

 by Mr. Woodward. Mr. Woodward's conclusion that the Black 

 Shales are absent from beneath Rugby depends upon the identification 

 of 10 feet of ' hard light stone ', which rests upon ' red clay ', that is, 

 Keuper Marls. Mr. Woodward regards this ' hard light stone ' as 

 White Lias.* I am inclined to follow J. M. Wilson, who considered 

 the 12-foot bed of limestone reached at a depth of from 390 to 402 feet 

 from the surface that subdivision, and Wilson's "dark and brown 

 clays [58 feet] " and "black clay [20 feet]" the equivalents of the 

 Gotham and Westbury Beds of the Rhaetic. The 'hard light stone', 

 according to this view, would be Tta-green Marl (Keuper). 



In times past the White Lias was frequently exposed in the 

 neighbourhood of Church Lawford, and a number of fossils have been 

 recorded.^ But now all the small lime-works have been closed, and 

 the only place at which I noticed traces of White Lias was at the 

 locality called ' Bath ', near Kings jSTewnham. Here there are a great 

 number of old kilns, mainly constructed of White Lias that was 

 doubtless obtained from the workings. The pieces of rock built into 

 the kiln walls are, except for what must have been the top-bed, 

 scantily-fossiliferous. This top-bed is very ferruginous, extremely 

 rich in specimens of Pseudomonotis, and has a waterworn and bored 

 upper surface. Thence northwards to th^ county-boundaiy the solid 

 rocks are hidden by drift. 



ISrOTICES OIF IMIEnynOIiRS. 



I. — A Remarkable Saksen or Gretwethee.^ By A. Irving, D.Sc.,B. A.' 



WITHOUT desiring to add to the existing plethora of literature on 

 these rocks the author thinks that this sarsen is worth special 

 notice. It was discovered last winter in digging a grave in the 



^ The Jurassic Eocks of Britain — The Lias, etc., pp. 151, 162. 



" Horizontal Section (Geol. Surv.), Sheet 140, and Explanation, 1891, p. 10. 



■' Eeport Kugby Sch. Nat. Hist. Soc, 1868, pp. 41-2 and plate. 



■* The Jurassic Rocks of Britain — The Lias, etc., p. 165. 



^ E. Cleminshaw, Eeport Eugby Sch. Nat. Hist. Soc, 1867, p. 32; ibid., 

 1868, p. 43 ; T. B. Oldham & G. Jones, ibid., 1877, p. 48; T. B. Oldham, 

 ibid., pp. 49-54. 



" A popular account of this block was given by the author in the Herts and 

 Essex Observer, January 7, 1911. 



■^ Eead before Section C (Geology), British Association, Portsmouth, 

 September, 1911. 



DECADE V. — VOL. IX. — NO. I. 3 



