SOMK I.OCAf, DKTAILS. 



1!)7 



III this scclidii ili(. i,rrcfil('r piirt ..(' ihc tliickiiess (•(.rrt-s- 

 Iioiids lo the L(m1;i cliiv, wliicli nt this |.liic(' is tliiiiiicr and 

 iiKire lossilifcrous tliaii usual. AIdiil; the sdiitli-cast side 

 <'!' the Mountain, and in the ciiy.if Mnnlival, the \)ViU 

 liavc liccn cxjioscd in a uivat iiuiiiIm'I' df j. laces, and arc in 

 lln" a.^oTcnalc at least l(i{) feet thick, tlionuli tJic tjiickiicss 

 is evidently very variahle. The succession may lie slated 

 as follows : 



1. Sdj'Inini Sand. — Fine uniformly .uraiiu'd yellowish and 

 p'ay silicious sand with occasional \)v^U of ^^ravel in 

 some i)luces, and a few laro-e Lanrentian Ix.ulderp, 

 S((xkr(r(f,Mi//i/i's,S:v., in the lower jiart. Thickness 

 varial)le, in some places 10 feet oi' nu)re. 



'2. Lr<l((CI((ii. — rncluous ^rayand reddish calcareous clay, 

 which can he oltserved to he arraiiucd in layers 

 varying sligiilly in colour and texture. Some of 

 these layers have sandy i)artiiius in which are 

 usually Foraminifera and shells or frau'inents of 

 shells. In the clay itself the only shells usually 

 found are Lctla arcfini and a smooth dee])-water 

 form of TcWma (iiwitlainHni ; hut toward the 

 surface of the clay, in i)laces where it: has not been 

 denuded before the deposition of the overlying sand, 

 there are many s^tecies of marine shells. A few- 

 large boulders are scattered through the Leda clay. 



3. Boulder-cI(i//.—HuW gray stony clay, or till, with large 

 boulders and many glaciated stones, often of the same 

 Trenton rocks which occur on the tlanks of the 

 mountain. It is of great thickness, though it has been 

 nuieh denuded in places, and has not l)een oljserved 



._ to contain fossils. It is especially thick at the soutli 

 and south-west sides of the Montreal mountain. 



