Jin ffiarlg Jfrolithic ptchen-iuibkn 

 ^posit at f lashentodl, 

 rim* (Eorfe totle, t 



By CLEMENT REID, F.L.S., F.G.S. 



December 13th, 1895, 



HE calcareous tufa found at Blashenwell, near Corfe 

 Castle, was first described in 1857 by Mr. Mansel- 

 Pleydell t (then J. C. Mansel) and by the Rev. 

 J. C. Austen, and a further account of it was 

 given by Mr. Mansel-Pleydell in 1SS6.* It has 

 also been studied by Mr. Carus- Wilson and Dr. 

 Turner, whose work, however, is still unpublished. 

 When I commenced, in 1894, the examination of 

 the Tertiary strata of Dorset for the Geological Survey this tufa 

 was mentioned by my colleague, Mr. Strahan, as an interesting 

 deposit, which he would like me to see, he having already traced 

 out its limits while engaged on the survey of the Purbeck strata. 

 Mr. A. R. Wallace also drew my attention to it, and it was partly 

 in his company and in the company of Mr. Mansel-Pleydell that 



t Communicated by permission of the Director- General of the 

 Geological Survey, 



J Papers read before the Purbeck Society, pp. 120, 175. 

 I bid., p. 124. 

 * Proc, Dorset Field Club, vol. vii., p. 109, 1886. 



