94 KEPORT— 1876. 



in length and about 300 feet in height, as the lakes in that Glen must have been 

 separated by a blockage of these dimensions. 



Dr. Tyndall alleges that all the glens on the south side of Glen Spean were filled 

 with ice, whilst those on the north side were filled with water. But so far from 

 there being evidence of these valleys being filled with ice, it appears that they also 

 were occupied by lakes, the traces of which are still visible in old beach lines. 



Even if there had been glaciers in Glens Treig and N'Eoiu, as suggested by Mr. 

 Jameson, it would have been impossible for these glaciers to have protruded tongues 

 long enough to have reached the places in Glens Hoy and Collarig where barriers 

 are required to have been. 



On High-level Terraces in Carron Valley, County of Liiilitlujow, 

 By David Milne-Home, LL.D. 



The river Carron runs into the Frith of Forth near Grangemouth. The princi- 

 pal tributary is the Bonny. 



The whole of that district situated to the east of the Kilsyth and Gargunnoch 

 hills is covered with deep beds of gravel and sand. The sand occurs in beds, mostly 

 stratified and generally horizontal. 



No marine fossils have been found in these drift-beds ; but the great probability 

 is that they are marine. 



The first set of ten-aces occur at a height of about 140 to 150 feet above the sea. 

 Flats at that height occur on both sides of the valley some miles west of Falkirk ; 

 these flats slope towards the eastward, i. e. towards the sea, so that near Grange- 

 mouth they very little exceed 50 or 60 feet above the sea. 



Terraces at a height of from 140 to 150 feet occur also in the upper parts of the 

 Carse of Stirling. 



The second set of terraces occurs only along the banks of the rivers, and is at a 

 height in the Carron of about 35 feet, and in the Bonny of about 29 feet above the 

 present coiu'se of these rivers. 



It is presumable that these haughs were formed when the Carron ran in a channel 

 about 27 feet above its present level, and when the Bonny ran about 23 feet above 

 its present level. 



The formation of these haughs indicates that the rivers had run permanently in 

 channels at that height. The sea therefore, in sinking, had paused in the process, 

 and had stood at a height of about 24 or 25 feet above the present level. 



This inference is confirmed by the fact of there being traces of an old sea-beach 

 at about that height visible along the coast of the Frith of Forth. 



The pebbles in the gi-avel-beds of the district are generally fragments of the hard 

 porphyry rocks of the Gargunnoch and Kilsyth hills, situated to the westward. 

 They could have come from no other quarter. 



On the Bagshot Peat-Beds. By W. S. Mitchell, LL,B. 



On Circinnate Vernation of Sphenopteris afflnis from the Earliest Stage to 

 Completion ; and on the Discovery of Staphylopteris, a Genus new to British 

 Bods. By C. W. Peach, A.L.S. 



The author stated that he had met with Sphenopteris qffitiis in the Carboniferous 

 " blaes " (shales) of an oil-shale pit at West Calder, near Edinburgh, in circinnate 

 vernation, and with it a curious form, apparently a Staphylopteris (?), new to British 

 rocks. Several species of this new genus have been found in Carboniferous rocks 

 by the officers of the Geological Survey of Illinois and Arkansas, in America; these 

 are figured and described by Leo Lesquereux in the Geological Transactions of those 

 States. The author stated that his difiered from all these, and thus, until more is 

 known about the British one, he had provisionally gi-\en it their generic name. 



1 



