OF DENISOX UNIVERSITY. 2 1 



the opposite side at an acute angle, the resulting surface being slightly 

 concave. 



Our specimens are fragments which do not furnish material for 

 careful description. The symmetrical relati:;n of ihe two sides indi- 

 cates a cephalopod in spite of the apparent absence of septa. The 

 siphuncle seems to be central. The greatest diameter was not less 

 than 75 mm; dorso-ventral diameter of volution near end, 15 mm : 

 lateral di imeter of volution. 6 mm ; the width of the plane dorsal 

 margin is 3 mm N. pauper, Whitfield may prove identical with our 

 form, but it would not be suspected except from incidental similarities 

 and the fact that our form is derived trom the same horizon at Ful- 

 ton ham. 



West of Fultonham, two or three miles, are exposures which per- 

 mit the reconstruction of the following section : 



Coal measure santUtone (exposed) - 10 ft. 



Bituminous sliale .>'•_' '^^• 



Limestone , ii> >"• 



Shaie (many fossils) 2^2 ft. 



Sandy layer 5-6 ft. 



Firm limestone 6-ioft. 



Shale : 3-6 ^t. 



Reddish and grey silicious shale and freestone — Waver 



ly (exposed) ■" f'- 



The section not being continuous may not be very accurate, but 

 expresses the approximate relations. No inconformity could be de- 

 tected between the shales forming here the base of the coal-measures 

 and the reddish layers, which are undoiibh.'(lly Waverly and contain 

 Chonetes illinoiscnsis and other characteristic fossils. 



The Waverly layers for some distance below the coal-measures 

 are, except in a band about 4 feet from the toj). ap|)arenily imfossilif- 

 erous. .\bout two and one half miles east of Rushville is exposed 

 about 20 feet of Waverly, which lies about 70 feet below the toj) of 

 the Chester ( Maxville) and hence, if that series has there its maximum 

 development, some 50-60 feet below its base. This exi)osure is inter- 

 esting on account of the presence in it of a Trilobiie {Philhpsia mera- 

 mecensis) not found in the lower beds of the Waverly and having a 



