79 
TRANSACTIONS OP THE SECTIONS. 
Web has existed, and to have been formed at a period of some comparative peolo- 
fid antiquity. On the north-west coast of Arran the ancient sea-clift is •>() to l 
!;<t high; and the opening of Glen Iovsa is tilled to a considerable height with ter- 
of detritus. The lower part of this detritus is composed of blue clnv and small 
iKvon boulders: over it is a bed of eoutafftm) Btld then filM MUI0. °OW> Of 
detritus has been throwu over on tho face of the cliff itself, showing it* origin to 
httbso posterior to the incising action of the sea, by which the terrncc was formed, 
nm'ace of the drift is not less than MO feet above (he sea-lcvcl, and it i« consi- 
:o be the product of a glacier once filling Glen Iorsa. The coarse sand and 
•"■•rd indicate periods at which the land occupied different level* nnd the sea pctie- 
‘"iinl into the valley; thus it becomes clear that the date of tlie terrace of erosion 
1 uiit-rior to the period of sub-acrial glaciers, and that this again has been followed 
■ an immersion; a succession of events requiring a great length of time. 
' Observations on Glacial Pluenome/vi in Scotland and the North of 
England. By Robert Chambers, F.R.S.F., F.G.S. <5r c. 
Jl* author referred to his former attempt to establish a distinction between an 
Morm 1 ° l ’j ration of ice over the surface of Scotland, by which the boulder clay 
^tned, and a more recent presence of valley glaciers’ in the chief uiountain- 
"‘•Ak e TL" S , aB ' ts monument a looser and coarser detritus, like the moraines of 
tL f lh<! . rBU Pposed to have taken place without the presence of the 
W ’ 1 *' tke fica or witli ico covering so lni;;e a surface as not to allow 
tn ’ } y '*\ 28 the west coast of Northern Greenland, Dr. Kink has shown 
' Ll cottt e , vasl thickness is coutiuuully advancing from the interior to 
iBS ‘ here f^hing Off i„ icebergs. ' 
4wv»d in m v C i trl,e moraines, or suh-acrial glacial deposits, have been 
’■filial morain° ° l le vade y. a ot ’ Ben Mncdui, Aberdeenshire, where conspicuous 
^ l *o apan _a 8 l J CC ^ u y nt r ariou « stages; in Glen Denrg four of these ucctir, a mile 
‘' rin 1700 f e 7f i 1ei8 , ol onu t,f them is MO feet, the bottom of the valley being 
^ also a rem-ivt \°i Ve .®ca. In the valley of the Doc, the lateral vale of Muick 
' J3 * Aberfelflv * * sevius of moraines at a much lower level. In the T'uy valley 
^ tG *rtliCiwil UOt m ° re l,mn :J0 ° feet “hove the sea, there is moraine matter; and 
: * “thw extttnri iire 1 aomo moi ' c recent terminal moraines of the same glacier. These 
'''v ^p a ‘ :ll Cfect Wl mt Sectors have been in Scotland, wherever tho moun- 
, ! ' T1 N mountain# S , co . ttisl1 moraines ia connected with shallow recesses of the more 
Qu ‘w«rd i«m being placed in froI »t of (hem, us if masses of snow had gathered 
V r l of tl a« °? f ,0ok place, earn ing coarse detritus for a few hundred 
V' , 5°nfine Lool.oto? 1818 in Bcnmore Coiguch, near Ullapool, mid the moraines 
'^Wjjaf , hovral and liramly ore of the same class. Loch Skeen, Dum- 
y L^ feet. In f-Z anat hcr such moraine, the hills being 2(300 feet high, and the 
^riLpj IUS; hut there i ° ? recess to the westward arc other lines and humps 
W? f 2 gate i u a Jji *» l V e * aler haring escaped by a passage still as clearly 
•* rr an, 5 g f , . • A similar recess-moraine occurs in the valley of Loch 
In ,1 lllc ,p ce»s U ae?, • °i l , he Bea ' a Writing in length, with un opening in the 
fci‘ v ! ak « district „!• p y n morass. 
acli ° n >n Uie TK;.i ' n ° and the author had obtained additional evidence of 
*hlcdi!!n ai ' ri|ise i which !° Cro Vade J r . "here it enter* the cross valley below the Pass 
l-l e des C (.mti t " m ? cU , wit1 ' ’he Grasmere valley. There is a remark- 
1W * e t,e train of ] ,E C lid side, about 30 feet hiuh, its surface bristled with 
•oiul Va % ■ furthaJ 5 ! 111,18 a g'oeier 300 or 100 feet deep, coming clown the 
^Th e down arc other heaps of detritus along with rounded and 
n '„ 0l " | Lin s S ;,-'fT, ns C11 'ho (wo sets of glacial phenomena were made at 
'’-'d, ^GOO tVpt *j . n> wk ich rises from a base 1100 feet above the sea to 
i. a, ^‘i* away tn ih ls com J ,OE ‘ d of quartz rock. It is abrupt to the weafc- 
fast» a ,°i Ut H^'Way nn ' L 0 Ca , St i. t lc to P °« the ridge is thickly strewn with loose 
’’ there are exair, i a „ ve , tke ' eve l of Fcrragon, the highest mountain to 
nples of striated surfaces, and others within a few hundred 
