314 Geological Society. 



and that the boulder-rock is not a fault-breccia or a crush- conglome- 

 rate, but a ' till.' In the absence of fossils the Gaisa formation is 

 doubtfully assigned to an early Palaeozoic age. It exhibits the 

 same sedimentary characters as the rocks of later date in other 

 parts of the world in which glacial phenomena have been observed. 

 The glacial episode is attributed to a temporary change of climate 

 rather than to the high latitude in which the section lies. 



2. ' The Eaised Beaches and Glacial Deposits of the Yaranger 

 Fiord.' By Aubrey Strahan, Esq., M.A., F.G.S. 



The Eaised Beaches range up to nearly 300 feet above the sea. 

 Though a number of impersistent shingle-banks occur at various 

 heights, the highest is constant, and can be traced along the same 

 level either as a shingly terrace or by a zone of wave-worn rocks. 

 Evidence is furnished by the relative size of different parts of the 

 beach that the prevalent wave-action was from the west, and by 

 the greater abundance of erratics on or below the beach than above 

 it, that floating ice was at work. 



At the head of the fiord a blue clay dotted over with stones is 

 now being formed, and the raised beach there consists of a similar 

 material. Both here and elsewhere this clay simulates a Boulder 

 Clay ; but for reasons given it is believed to be a marine fiord- 

 deposit, into which many stones have been dropped by floating ice. 



Deposits of true glacial age, in the form of mounds of gravel, are 

 described, and shown to have yielded the material out of which 

 parts of the Eaised Beaches are formed. The glaciation of the fiord 

 is attributed to floating ice, and is shown to have taken place before 

 the formation of the Eaised Beaches, at a time when the sea sur- 

 rounded this part of Finmark, by way of the Yaranger Fiord, the 

 Tana Yalley, and the Tana Fiord. 



February 3rd. — Dr. Henry Hicks, F.E.S., President, 

 in the Chair. 



The following communications were read : — 



1. 'The Subgenera Petalograptus and CephaXograptus? By Miss 

 G. L. Elles. 



2. ' On some Superficial Deposits in Cutch.' By the Eev. J. F. 

 Blake, M.A., F.G.S. 



The author arranges the deposits of which he treats under the 

 following heads: — 1. Subrecent Concrete; 2. Boulder Beds asso- 

 ciated with the former ; 3. Quartzite Beefs ; 4. Infratrappean 

 Grits ; 5. Laterite ; 6. Alluvium and Eann. 



1. The Subrecent Concrete consists of a calcareous, porous, lami- 

 nated sand with milioline remains, which extends to a height of 

 about 700 feet above the Eann, and has a discontinuous distribution. 

 The author gives reasons for regarding this as an aeolian deposit, 

 partly derived from recent marine accumulations and blown inland 

 and uphill by the prevalent winds. 



