742 Geological Society : — 



Jordan Trench, especially the western fault and fault-blocks in 

 the Trench or against its walls that have not sunk equally with 

 others ; the upturned block of Jebel Usduni which, with the Dead 

 Sea bottom and the block north of Jericho, indicates a median 

 fault between the boundary-faults ; the interbanding of the Jebel- 

 Usdum salt with sandstone and shales that resemble Nubian Sand- 

 stone ; the unconformity of the Jebel-Usdum formation with the 

 Jordan lake-beds (Lisan formation) which with the chemical com- 

 position of the salt (lack of bromine, etc.) shows that it is not a 

 Jordan lake-deposit ; high lake-terraces in the centre of the Trench, 

 with corresponding ones north of Tiberias and south in the Araba 

 Valley, showing that the Jordan lake stood 1400 feet above the 

 present Dead Sea, and that there has been no marked warping since 

 their formation ; old gravel-filled canons of the Arnon and Terka 

 Main which prove that the level of the Dead Sea before Jordan-lake- 

 days stood at about its present level, and that climatic conditions 

 must have been about the same, also that it did not long precede 

 the Jordan lake; the Lisan formation of the Jordan lake-beds, 

 thin layers of mechanical and chemical sediments veneered along 

 the Jordan river with fluviatile clays ; bad-land topograph}^ near 

 the wadis and in the Lisan formation : narrow box canons of the 

 wadis in the Jordan Trench and the more open valleys above 

 producing a sort of ' hanging valley.' 



In the main, Blanckenhorn's recent work was confirmed, in 

 particular the fault forming the western border of the Trench and 

 disturbances and sinking in the tableland ; but new points were 

 mentioned, such as the evidence of a median fault within the 

 Trench ; the sea-clifls of Lisan and Jebel-Usdum ; the wave-cut 

 shelf and the salt of Jebel Usclum ; the tilting of the Jebel-Usdum 

 block and its independence from and unconformity with the old 

 lacustrine beds; kick of disturbance and of warping since their 

 deposition ; the age and former level of the Old Dead Sea and the 

 recent rise in the present sea., the latter indicating an increase in 

 moisture and not drier conditions as generally supposed. 



May 21st.— Mr. GAY. Lamplugh, F.E.S., President, 

 in the Chair. 



The following communications were read : — 



1. 'The Silurian Eocks of May Hill.' By Charles Irving 

 Gardiner, M.A., F.GLS. With an Appendix by Frederick Eichard 

 Cowper Eeed, Sc.D., F.G-.S. 



The district of May Hill comprises a small area of ashy grits, 

 which Dr. Callaway in 1900 considered to be of Pre- Cambrian age. 

 The evidence now available does not seem to warrant any definite 

 opinion as regards the age of these beds. Llandovery sandstones 

 are extensively developed, and are of Upper Llandovery age. They 

 consist of a lower division of coarse sandstones and conglomerates, 

 and an upper one of fine sandstones. No beds of Tarannon age occur. 



