SOMK U)CAL I)F/rAILS. 187 



aboiU one himdred and tit'lv feet alxtve the level of tlie 

 sea, and is coniiMJSed of elay, ( apju'd with sand and jj;ravel. 

 At no ii;real distance inland, there risi-s a set'ond terrace 

 one hundred and sixty feel higher than the iirst, or about 

 three hundicd and ten feet ahove tlie sea. In some 

 places the front of this terrace is cut into two or more. 

 It consists of clay ca]))ied with sand and liravel, witii some 

 lar<ie stones and Laureiitian boulders. Still farther inland 

 is a third terrace, tlie heiuht of whicdi was estimated at 

 four hundred to foui' hundred and fifty feet. 



In tlie first mentioned of the aliove terraces, a vei'v 

 deeji railway cuttin<j; has been nuide, exposing a thick bed 

 of homoo-encous clay of a ]iurplish Lfray cohjur, and 

 extrenu'ly tenacious. It contains few fossils: and these, 

 as far as I could ascertain, exclusi\'ely Lidn fjldcinlis. It 

 is, in short, a typical Leila clay, and its thicku'jss in this 

 lower terrace can scarcely be less than one hundred and 

 twenty feet. .Vs tlie inland terraces are probably also 

 cut out of it. this may Ite less than half of its maxinnim 

 depth, ruder the Leda (day a tyi)ical boulder-clay had 

 been exposed at one place in di^ugin^ a mill sluice. It 

 seemed to be about twenty feet thick, and rests on the 

 smoothed edues of the shales of the C^)uel)ee ,u;roup. 



Though the Leda clay at the Trois Pistoles seems 

 perfectly homo,L!;eneous. it shows indicati<»ns of stratifica- 

 tion, and holds a few lai'ue Laurentian boulders, which 

 become more numerous in tracing' it to the westward. A 

 short distance westward of Trois Pistoles, it is seen to lie 

 overlaid by a boulder-deposit, in some places consisting of 

 large loose boulders, in others approaching to the character 

 of a true bouldcr-clay or associated with stratified sand 

 ami gravel. We thus have boulder-clay below, next 

 Leda clav, antl above this a second boulder-drift as.sociated 



