TRANSACTIONS OF SECTION C. 659 



The author thinks it desirable that some of tlie more definite forms among 

 the variety found on the slabs from the ' footprint bed ' at this quarry should be 

 accurately determined, if possible, instead of being included, as at present, under 

 the general term of ' Cheirotherian.' 



The author pointed out that, although fifty years bave elapsed since its 

 original discovery, the nature of the aniiual which made the impressions is still 

 as much a mystery as ever ; and that the more we study the known forms of 

 Labyrinthodonts, we are forced to conclude that, whatever was the animal by 

 ■which the larger five-toed footprints at Storeton were made, it cannot be referred 

 to any known species of Labyrinthodont. 



Dr. Tempest Anderson exhibited in the Geographical Section Eoom a series of 

 lantern slides illustrating the volcanoes of Iceland. 



MONDAY, AUGUSTS. 

 The following Reports and Papers were read : — 



1. Meport on Erratic Blocks. 

 [Will be published in the Report for 1895.] 



Rejwrt of the Committee on the High-level Shell-hearing Deposits of 

 Clava, <kc. — See Reports, p. 307. 



3. On some Lacustrine Deposits of the Glacial Period in Middlesex. 

 By Henry Hicks, M.D., F.R.S., F.G.S. 



In this paper the author refers to some deposits, consisting of stratified gravels, 

 sands, and clay, varying in thickness from a few feet to over 20 feet, which are 

 spread out over the plateaux of Hendon, Finchley, and Whetstone. They are 

 frequently covered over by the chalky Boulder Clay with northern erratics ; but 

 seldom themselves contain other materials than those which could have been 

 derived from the Tertiary or Cretaceous series in the south-east of England. No 

 marine fossils of contemporaneous age have been found in these deposits, but 

 remains of land animals occur occasionally in and under them. The author has 

 found that their geographical distribution is much wider than has usually been 

 supposed, and he has been led to the conclusion that they must have been deposited 

 durng the glacial period in a lake, whose waters attained to a height of nearly 400 

 feet above present O.D. This lake, he believes, occupied a considerable area in the 

 south-east of England, and spread for some distance south of the Thames, but was 

 dammed up on the east and west by ice and morainic matter. As the lake became 

 gradually reduced in size, lakelets were formed in the Thames valley, and the 

 stratified deposits now found there, except those in the immediate proximity of the 

 present Thames and its tributaries, date back to that period. Man, however, lived 

 in the valley before any of these deposits were thrown down ; hence it is that the 

 flint implements and the mammalian remains usually occur under, or in the lower 

 parts of, the deposits. 



4. On Sporadic Glaciation in the Harlech Mountains, 

 By the Rev. J. F. Blake, M.A., F.G.S. 



The author drew a distinction between two results of glaciation — the one, 

 negative, in which the rocks are rounded and striated, and all or nearly all the 

 debris removed ; the other, positive, in which the rocks ai'e covered by a thick 

 deposit of drift with boulders. In the Harlech Mountains district areas showing 



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