The characlor of tlio fossils in this jjrouj) of formations has 

 hvvu fiillv tliscnsscd h,v Chirivc. The fMiiiin of Ihr Portajj^o series 

 as a wh(»h' is liij^hlv «listin(ti\(' aiul not l<> he ronliisiMl with that 

 l>rec('(linjr or with ilie (Mirmiinj; fauna wliirii foHows. The hit-* 

 tci' is sjuM-ially rhaiactt'iizcd by prrN ai!in«»; hi-acliiiipod types, a 

 ;rronp almost wliolly wantinji in ih<* Portaj^r, mikI /»/• mnlra 

 \\\v prculiar lamcllilnanriis and (('jdialopods of the lN)rtay:e are 

 not carried over into tiic (MKMiinnjj: fauna saM' as one species or 

 anoth<M' may lia\c sui'vi\«Ml ih«' ^cncial iuNMsion of the ('h('mun«^ 

 fauna from tlir cast. 



in th<* town of Xa|>lcs. alxMit ^0 mih*s cast of tlic (lenesee 

 river the upper beds of tlie (icncsce shale, all of the Portage 

 divisicuis and several hundred fe<*t of lower Chemung strata, in 

 the aggregate mM hss than I.IOO feet, ar<' abumhmtly exposed 

 in the numerous ravines and lock cscaijuncnts about tin* soutli 

 end of the Na]des valley. 



ill tin* strata above the (ienesee shale the ]»roportion of sandy 

 s<'diment, in the shape (d' Hags and thin sandstones is noticeably 

 greater than in the (ienesee river section, and the thickiH'SS of 

 the subdivisions is iKd the same, still the dilTereiUM's in litho- 

 logir characlei- mic so small, that no dilVn uliy is ex|M*rienced in 

 tlist inguishing the several sidMliv isions as iHM'viously described. 



The uj>l»er beds (d" the (lenesee, siKM-eediMl by tli<' band of 

 lighter rolore«l shales and Mags, and next above, the lower black 

 ]»and aie exposed along the load leading westward on tlie 

 Naples-I»ristol town line near \\'ood\ille juid near the mouth of 

 the Sn\(lei- gully. ^ iiiih' south. 



The h>|> of the (lenesee shale in the r<iad west of Woodville is 

 7.")l' A.T. This ]ioint as indi«ated on the Naph*s sheet of the 

 topograj)hic m;i|» is (»ii the liiw (d" 41* HK which crosses tlie 

 (ienesee river .'» inijj's south <d* the mouth (d* the gorge at Mt 

 Mmris and :iliii<>si exactly at the place where the top of the 

 ('ashacpia shale dips bcdow the liver level, which is here 002' 

 A.T. The top of the (ienes4'e shale at Woodville is therefore 

 the difference in levels, ^ W) feet, j.liis the thickness of the 



