part 4] JURASSIC CHRONOLoaY. 455 



(7) The white lithographic bed of Burton Bradstock is cited as 



evidence of stratal repetition, and a theory as to the 

 deposition and ahnost complete destruction of this Burton 

 bed is put forward. 



(8) The A'Yatton and Burton lithographic beds are cited as 



evidence of Alpenkalk conditions prevailing in Western 

 Europe during two well-se2mrated Jurassic dates, both of 

 them far earlier than the times of Alpenkalk deposits in 

 Central and Eastern Europe. 

 '(9) Certain remarks are made ujoon sections at Milborne Wick 

 and Haselbury (Somerset) with regard to the dating of 

 their deposits, and a table of the succession and distribu- 

 tion of Hammatoceratids is given. 



(10) A paloeontological note describes a new species of Bhjaicho- 



nellid — Tetrarlujucliia fliorncomhiensis {liliijnclionella 

 northamptoneiisis auctt., passim) — a species marking a 

 particular deposit at Thorncombe Beacon. 



(11) An Appendix by Mr. J. F. Jackson gives the result of his 



studies of various sections of the Junction-Bed (including 

 the Watton Bed) on the Dorset coast, 



(12) A second Appendix gives studies by Dr. L. F. Spath and 



by Mr. J. Pringle & Mr. A. Templeman of the stratal 

 and faunal (ammonite) succession revealed by certain new 

 exposures in the Upper and Middle Lias near Barrington 

 (Somerset) — the collecting of specimens having been done 

 almost inch by inch. 



(13) The evidence thus obtained, added to that gleaned elsewhere, 



some of it set out in the body of the paper, enables the 

 Author (S. S. Buckman) to put forward a tabular sketch 

 of Upper Lias chronology more detailed than has yet been 

 attempted — -dividing the ages (Yeovilian and Whitbianj 

 of the Upper Lias into thirtj^-five hemera^ — more divisions 

 than were originally made b}^ Oppel for the whole of the 

 Jurassic. 



DiscussiojS". 



Mr. J. PRiiSTGLE said that, as joint author of one of the 

 Appendices, he would refer to the salient features of the work 

 done by Mr. A. Templeman and himself on the Upper Lias exposed 

 in certain quarries at Barrington. These beds had been described 

 by Charles Moore, and the reopening of the sections after a long- 

 period of disuse had provided an opportunit}^ of examining the 

 Upper Lias, with a vicAv to the correlation of the deposits with 

 those of the Banbury district. The section was carefully col- 

 lected over bed by bed, and more than a thousand specimens 

 of ammonites were secured. The value of the results obtained 

 had been much enhanced by Mr. Buckman's co-operation. 



Dr. A. MoRLEY Dayies said that the deposits in a shallow sea 

 transgressing over an area where folding and faulting movements 



