Correspondence — A. R. Horwood. 381 



I have not stated that A. granulatus does occur there, and if I could 

 not point to an undoubted A. granulatus from a horizon at which any 

 Eelemnites are most exceptional occurrences it would not prove that 

 A. granulatus never occurs there, as assumed by Mr. Jukes-Browne. 

 It so happens that the challenge can be met out of his own mouth. 

 He says: " With respect to Sussex I relied on the published records, 

 according to which ... in the cliffs between Seaford and Brighton 

 . . . A. granulatus occurred through at least the lower 150 feet." 

 As the zone of 0. pilula is only from 100 to 110 feet thick in the 

 Sussex cliffs (and does not exceed 105 feet at Seaford), A. granulatus 

 at 150 feet must be well up in the restricted zone of A, quadratus. 

 Specimens of A. granulatus occurring at 120 feet would be equally, 

 though less deeply, in the restricted zone of ^. quadratus. 



R. M. Brydone. 

 27 TwYFORD Mansions, W. 



THE LEICESTEESHIKE AND SOUTH DERBYSHIEE COAL-FIELD. 



Sir, — I shall be much obliged if any readers of the Geological 

 Magazine can inform me of the whereabouts of a collection of Coal- 

 measure fossils, chiefly plants, made by Edward Mammatt, author 

 of Geological Facts. He was the first man, as a pupil of William 

 Smith, to put into practice for Carboniferous zonal work the 

 principle that strata are characterized by their organic remains. 

 A detailed coloured section is given in his work, with the position of 

 fossils found indicated. Moreover, these fossils are figured in his 

 work, but unfortunately in the state of lithography at that time 

 accuracy was not possible, and it would be necessary to examine the 

 originals in many cases to be sure what fossil is intended. So valuable 

 is this record, since the sections are now bricked in, that the 

 information the fossils could afford would be of the greatest assistance 

 to me in further working out the palaeontology of this coal-field. 

 Mammatt was a friend of the late Professor A. H. Green, who 

 surveyed part of the district, afterwards going to Oxford. 



Inquiries were made amongst several colleagues when my 

 preliminary account of this coal-field was communicated to the Survey 

 memoir on this coal-field, published in 1907, but 1 was then unable to 

 obtain any information. Since I am hoping to revise this account, 

 which was drawn up before the work had gone very far, and as 

 I have a good deal of additional information, any facts of importance 

 that may be known to readers of this Magazine will be cordially 

 welcomed. 



When the above-mentioned account was written, reliance had to 

 be placed upon certain data which may, after a fuller study of the 

 question, have to be read in a new light, in spite of the fact that 

 my friend the late Mr. Fox-Strangways and I were satisfied with 

 them at the time. It is in this connexion that Mammatt's sections 

 are specially interesting. — Yours truly, 



A. R. HoEwooD. 



Leicester Museum. 

 July 9, 1913. 



