257 



from some of the Cincitmati group species ilescriljeJ by Prof. S. A. 

 Miller, as well as a number of species awaiting identitication. 



A very interesting sub-excursion of the club was held at a short 

 distance froui the city in July hist, when the writer,- in company with 

 Messrs. Craig, Siimmerby and Dr. Loux, all enthusiastic members 

 and devotees to science, visited a number of interesting exposures in 

 the county of Russell. The Trenton was observed to crop out on the 

 10th lot of con. 10, Russel.l, and lot 30 of con. 5 of Cambridge, forming 

 a ridge or elevation above the general level of the country, the measures 

 dipping at an angle of about 15'^ to the north. There may be a dislo- 

 cation here, but the exposures were too limited to ascertain. The strike 

 is almost due east and west. Farther up, at Cook's Ra})ids, on the 

 River Castor, lot 8, con. 9 of Russell, was found a splendid expos- 

 ure of the Trenton formation for a distance of at least one mile, 

 characterized by abundance of fossils, over twenty species hav- 

 ing been collected and recorded from that place, amongst which 

 naay be mentioned the Brachiosponyid referred to already, Protarea 

 vetusta, If. rrasopora Sehoyni (Nich), BeUeroplion sulcutinus (Bil- 

 lings). 



The Ct'ica Formation. — To sum up briefly the results obtuned 

 in the very interesting series of bituminous schists and associated im- 

 pure limestones, it ma}' be said that in the exposures on the Rideau 

 Hall grounds the perfectly conformable position of the Utica on the 

 Trenton, or else the gradual passing of the Trenton measures into those 

 of this formation is very evident. That an unconformability has been 

 assigned to the Utica by many authors is a well known fact. The 

 measures at Rideau Hall immediately set at rest this question upon 

 examining them. Not only the stratigraphy agree^s, but also the mass 

 •of pah>jontological evidence which has already been g.ithered from this 

 formation, enables one to satisfy himself of the truths of the above 

 statement. There is no discordance of stratification whatever, and, 

 further, there are species and genera which pass from one into the 

 other gradually. In fact it is very difficult, nay, impossible, to give 

 the precise bed which is first characteristic of the Utica. 



The uppermost measures of the Trenton liave shales between the 

 layers of limestones ; the se.liment having assumed a more argillaceous 



