570 Reports and Proceedings — Geological Society of London. 



cross-references. The contents of proceedings of some of the learned 

 societies and academies have been indexed fully under subjects, 

 including the Kaiserliche Akademie der Wissenschaften zu "Wien, 

 the Palaeontographical and Eay Societies, Smithsonian Institution, etc. 

 A list of these is given, as well as lists of those proceedings partly 

 catalogued in detail and others catalogued collectively. The work 

 ■will be of the greatest value to students in art, literature, and science. 



I?,E1:P0KTS JiJlS^lD ^'E.OCElEIDIITGrS. 



I. — Geological Society of London. 



Novemler 3, 1909.— Professor W. J. SoUas, LL.D., Sc.D., F.E.S., 

 President, in the Chair. 



The following communications were read: — 



1. " Certain Jurassic (Lias-Oolite) Strata of South Dorset, and their 

 Correlation." By S. S. Buckman, P.G.S. 



(1) Descriptions are given of certain strata (Lower Bathonian to 

 Pliensbachian) on the Dorset coast — Chideock and Burton Bradstock. 



(2) Comparison is made with similar strata inland — with a summaiy 

 of beds at Stoke Knap ; with certain North Dorset strata ; with 

 Toarcian beds of Yorkshire and North amptonshire. 



(3) The strata described are classified according to what may be 

 called the ' multizonal ' or ' polyhemeral ' system in the main, 

 according to the scheme introduced for these strata in 1893 (5) ; 

 but further divisions due to other investigators and to the author 

 are dealt with. 



(4) The strata described are arranged among thirty - six zonal 

 (hemeral) divisions — a greater number of divisions than Oppel used 

 in 1856 for all the Jurassic rocks, of which these beds form but 

 a small part. 



(5) The Upper Lias part of the Junction Bed of Down Cliffs, 

 Chideock (Lower or 'pve-siriattdus Toarcian) is a very condensed, 

 imperfect epitome in 20 inches of about 80 feet of strata on the 

 Yorkshire coast, and of very much more, allowing for gaps. 



(6) Between the h if rotts -layer and the striatidus -layer of the 

 Junction Bed there is occasionally a 2 inch layer which is all that 

 represents some 250 feet of deposit in the Cotteswolds — so that about 

 2 feet of Junction Bed were formed while some 550 feet were being 

 deposited elsewhere. 



(7) The Upper Toarcian (nioorei-dicmortierioi hemerse) makes a great 

 show at Burton Bradstock and Down Cliffs as the Down Cliffs 

 Clay and Bridport Sands {pars) — the greatest thickness of rocks of 

 these dates in the country. 



(8) The sequence of aalensis -?>tr&.%Si above «200/'f /-beds is demonstrated 

 at Chideock Quarry Hill, in the upper part of the Bridport Sands. 



(9) The Inferior Oolite (Aalenian, Bajocian, Bathonian jo«rs) strata 

 of Burton and Chideock are not counterparts of one another : they 



