This shale \vell repays careful vStudy, for in it occur a large 

 number of those minute problematical bodies, the " Cono- 

 donts." They are readily detected by the use of a lens, and 

 from the natin'e of the rock in which thev are imbedded, 

 they are in an excellent state of preservation, and afford 

 interesting objects for microscopic study. 



Ambocoelin praeumhoiin ( Hall ) occurs in considerable 

 numbers in some portions of this shale, but the specimens 

 are smaller on the average than those found in the cal- 

 careous bed above. Liorhynchus multicostus (Hall) also 

 occurs, the specimens occasionally attaining great size. 

 Some of the specimens of this species from these shales, 

 approach much more closely to the typical L. quadricostatus 

 (Vanuxem) of the Genesee than any of those found either 

 above or below. Besides these, the minute pteropod Stvlio- 

 lina £ssureUa (Hall) occurs, often in considerable numbers, 

 on the laminae of the shale. 



Section 2 (G). 



Platk v. 



This section is a verv short one, being scarceh' more than 

 three hundred and fift\' feet in length. It is cut in the left 

 bank of the stream, and extends in the same general direc- 

 tion as the preceding one. The dip of the strata is greater 

 than that of Section 1, being about 2.5 degrees to the south- 

 east. A large portion of this section is covered by the de- 

 composed shale which the rains have caiTied down from 

 above, and on \vhich a strong growth of vegetation has 

 become established, obscuring the rocks underneath. In 

 consequence of this, the upper strata are well exposed only 

 near the up-stream end of the section, but from the steepness 

 of the bank at this point the stud}^ of these strata is 

 attended with considerable difficiilty. 



The Black Naples Shales appear at the top of this section, 

 and thc}^ are again exposed in a "dug way" w'hich leads 

 from the terrace, just beyond the section, to the top of the 



