SOMH LOCAL DKTAILS. Hi;) 



is fniilici' slmwii liy its slicUs. wliicli arc, on the wliok', u 

 iiioi'i! imidi'ni ass('iiililaL!e lliau tlmse (if llie Lcdu clay of 

 ^foiitrciil. Ill I'd-sils, as well as in flcvalioii, llii'so 1k.mIs 

 more nearly icscmlilc ilmsc on ilic coast of .Maiiii'. It 

 would thus a])]icar tlial the hoiihU'r-clay is not, a coiiliniious 

 shed or siialmii, lnit that its dinereiit portions were 

 formed at (htlereiit, liliies, durillu' the siiliincrLieiiee and 

 ide\ation of tin; country : ami it must ha\(' lieeii during' 

 the latter ]»rocess that the greater ]iart of the deposits 

 now under consideration were formed. 



T\\v. assemhlaue ctf shells at Kiviere-dii-Lou)) is, in 

 almost e\ery particular, that of the modern ^ulf of St. 

 Lawrence, more es[iccially on its iiorthei'ii coast. 'I'he 

 jUMncijial diClerence is the ])re\alence of Lk/k nirticd in 

 the lower part of the deposit. This shell, still li\in,u' in 

 Arctic America, has not yet occurred in tlie gulf of St. 

 Lawrence, lait is distrihuted throuuhout the lower jiart of 

 the Pleistocene deposits in the whole of Lower Canada 

 and Xew l^niiland, and appears in great numliers at 

 .Ki\iere-du-Loiip, not only in the ordinaiy form, l)iit in the 

 shortened and depau))erated Aarieties which ha\G been 

 named hy JJeeve L. si/i(^iH/ and L. sn/ri/'cra. 



Of ^{sldiif Lmi ri'iiliit iiii . su])posed to he extinct, and 

 which occurs soahiindantly in 'he I'leistoceue at ]Montreal. 

 few si)ecimens were found, and its place is supplied hy 

 an allied but apiparently distinct si)ecies, to he noticed in 

 the seijuel, which is still abundant at CJaspe and Labrador, 

 and on the coast of Xova Scotia. 



It must 1)6 observed that ihoULih the elavs at liiviere- 

 du-Lou]) are more recent than those of ^Montreal, they are 

 still of c(insiderable anti(|uity. They must have been 

 deposited in water perhaps fifty fatlioms deep, and the 

 bottom must have Iteen raised from that depth to its 

 14 



