378 . MR. s. s. BUCKMAX OX [vol. Ixxviii,. 



18. JuEASSic Cheoxology : II — Peelimixaey Studies. Cer- 

 tain JuEASsic Steata near Eypesmouth (Dorset) ; tlie 

 Juxctiox-Bed of Wattox Cliff and Associated Eocks. 

 ^Y S. S. BucKMAX, F.a.S. (Bead December 7th, 1921.) 



CONTEA^TS. 



Page 

 I. Introduction 378 



II. Stratal and Fannal Details 380 



(A) Watton Cliff — the main mass. 



(B) The Junction- Bed of Watton Cliff in detail — the 



Watton Bed. 



III. The Dating- of the Junction-Bed of Watton Cliff 390- 



(A) Upj)er Lias Succession in other Areas. 



(B) Additional Details concerning the Junction-Bed of 



Thorncombe Beacon. 



(C) The Middle Lias (Domerian) of Thorncombe Beacon. 



(D) Analyses of the Junction-Beds, and Theories as to 



the Watton Bed. 



lY. The White Bed of Burton Bradstock ' 420 



V. Certain Chronological Studies 431 



(A) Milborne Wick and the Green-grained Marl. 



(B) Haselbury and Hammatoceratids. 



VI. A Paleeontological Note — Tetrarhyncliia thorncoinhiensis, 



nom. noY 435 



YIL Bibliography 435 



YIIL Appendices. 



I : Sections of the Junction-Bed and Contiguous Deposits, 

 by James Frederick Jackson. [Palajontological 

 Notes by S. S. Buckman.] 436 



II : The Upper Lias Succession, by L. F. Spath, J. 



Pringle, A. Templeman, and S. S. Buckman 449 



(A) Introduction, by S. S. Buckman. 



(B) Upper Lias Succession near Ilminster (Somerset), 



by L. F. Spath. 



(C) Two New Sections in the Middle and Upper Lias 



at Barrington. near Ilminster (Somerset), by 

 J. Pringle and A. Templeman. 



(D) Upper and part of the Middle Lias Succession, and 



Correlation, by S. S. Buckman. 



IX. Summary 454 



I. IXTRODUCTIOX. 



This paper is to a certain extent a supplement to the communi-- 

 cation on ' Certain Jurassic Strata of South Dorset ' published by 

 tlie G-eolosfical Society in 1910, in so far as it contains a study of 

 another exposure of the Junction-Bed (Domerian, Whitbian, 

 Yeovilian) ^ discoyered farther east along the coast; but it also- 



^ I, 5, pp. 61, 64, 82. These numerals in the footnotes throughout refer to • 

 the Bibliography, § YII, pp. 435-36, 



