486 H. M. AMI — THE GEOLOGY OF QUEBEC. 



A larger collection of specimens from this locality would be interesting. 

 AVith the exception of Leptobolus insignis, Hall, Bellerophon bilobatus, Sow- 

 erby, and Triarthnis becki, Green, all very characteristic Utica species, the 

 forms are not well preserved. 



About a mile west of Charlesbourg church, on the road to Lorette, the 

 black bituminous shales of the Utica again crop out in a small brook, and 



the following forms occur: 



« 



Climacogr aphis, sp. und.; 

 Orfhograptus quadrimucro7iatns ; 

 Leptobolus insignis. 



L'Abbe Laflamme, of Laval university, who has devoted considerable at- 

 tention to the geographical distribution of the different terranes in this dis- 

 trict for the Canadian geological survey, collected a large slab of somewhat 

 indurated black calcareous and bituminous shale on which were the follow- 

 ing species : 



Orthograptus quadrimucronatus ; 



Leptobolus insignis; % 



Triarthrus becki. 



Poiute-aux-Trembles. — In 1888, Dr. Ells obtained the following species of 

 Utica fossils, overlying the Trenton limestones of Pointe-aux-Trembles: 



Orthograptus quadrimucronatus ; 

 Leptobolus insignis; 

 Triarthrus becki. 



These three forms are, as can be readily seen, typical and characteristic 

 and generally abound in every collection of Utica specimens. 



The Lorraine : General Character and Distribution. — The Lorraine shales 

 form the fourth of the series of geological terranes occurring along the 

 line of section from north to south, and consist for the most part of very 

 thin, fissile and evenly bedded calcareo-argillaceous and arenaceous shales, 

 weathering yellowish brown, measuring a thickness of 800 or 900 feet, and 

 overlying the black bituminous shales of the Utica terrane conformably. 

 They are extensively developed north of the city of Quebec, at Montmorency 

 falls, at St. Nicholas, along the southern shore, and also farther eastward 

 along the northern end of the Island of Orleans. These shales are not very 

 fossiliferous in most of the exposures, but sufficient fossil evidence has been 

 obtained to fix the position of the shales in the region where the thrust fault 

 which occurs has disturbed the strata considerably. They are separated from 

 the Quebec city massif by the thrust fault already indicated (which is evi- 



