152 mr. s. s. buckman on [June 19 I3 T 



9. The ' Kelloway Rock ' of Scarborough. 1 

 By S. S. Buckman, P.G.S. (Bead March 5th, 1913.) 



Contents. 



Page 



I. The Rock and its Ammonite Fauna 152 



II. Remarks on the Fauna and the Zones 156 



III. Palteon tological Remarks 162 



IV. On Development and Homoeomorphy 165 



I. The Bock and its Ammonite Fauna. 



Over fifty years ago an important paper on ' The Kelloway Bock 

 of the Yorkshire Coast ' was published by John Leckenby in 

 this Society's Journal. 2 It dealt chiefly, if not entirely, with the 

 development of the stratum in the neighbourhood of Scarborough. 

 From this rock he recorded over thirty species of ammonites, 

 many of which were new. Several of these were not figured, and 

 they may be said to have remained almost unknown to science,, 

 except perhaps locally. Even of those figured it has been difficult 

 to determine from the descriptions and illustrations what were 

 their generic affinities — a task not altogether easy, even when the 

 specimens themselves are handled. 



It is obvious from the ammonite fauna which Leckenby described 

 that the Kelloway Bock of Yorkshire comprises more than the 

 Kellaways Bock of Wiltshire, that it is in part a calcareous 

 equivalent of the Oxford Clay of the southern counties. But, at 

 the same time, this does not state the whole of the facts : for the 

 ammonite fauna of the Yorkshire stratum is not found, so far as 

 many species are concerned, in the Oxford Clay of the southern 

 counties ; while certain species of the Kellaways Buck are absent 

 from the Yorkshire deposit. It therefore becomes of interest to 

 see what the ammonites are, and what zonal series they represent. 



By the kindness of Prof. McKenny Hughes and Mr. Woods of 

 the Sedgwick Museum, Cambridge, all the types of the ammonites 

 described by Leckenby which are in their possession have been 

 sent to me for study. 3 The authorities of the Museum of Practical 

 Geology, Jermyn Street, London, have also sent to me a considerable 

 series of Callovian-Oxfordian ammonites for determination, among 

 them being many species from the Kelloway Bock of Yorkshire. 

 . To all these gentlemen I beg to tender my best thanks. 



1 The appellation ' Kelloway ' is here used for quotations from Leckenby or 

 in reference to Yorkshire beds, and 'Kellaways' in relation to deposits in 

 Wiltshire and elsewhere. 



2 Q. J. G. S. vol. xv (1859) p. 4. 



3 The intention is to figure these types in tone future issues of ' Yorkshire 

 Type Ammonites.' 



