28 



At Quebec and Levis. At Montmorency. 



| Lorraine. 



Utica. 



Ordovician • 



Upper 



r 



Middle -{Quebec City. Trenton. 



Lower 



Levis. 

 Sillery. 



LORRAINE (FRANKFORT) FORMATION. 



The Lorraine in this vicinity, is a fine, soft, grey shale, 

 with thin layers (i to 3 inches in thickness) of sandstone. 

 There are occasional thicker layers of sand or limestone 

 conglomerate. The thickness is at least 700 feet (215 m.), 

 with the top not seen. Fossils, other than a single species 

 of graptolite, Diplograptus pristis, are not common, but 

 a few species, Triarthrus becki, Cryptolithus tessellatus, 

 Plectambonites sericeus and Dalmanella testudinaria, have 

 been found. 



UTICA FORMATION. 



The Utica is a much darker and less micaceous shale 

 than the Lorraine, and contains, besides Triarthrus becki 

 and Leptobolus insignis, a considerable variety of grap- 

 tolites, Climacograptus typicalis and Climacograptus bicornis 

 being the more common. At the base is a small thickness 

 of impure, blocky limestone containing the same fauna, 

 with the addition of a few survivors from the Trenton. 

 The total thickness of the Utica is about 200 feet (60 m.). 



TRENTON FORMATION. 



The Trenton consists of thin-bedded, dark blue limestone 

 with shaly partings. It is extensively quarried, and used 

 for all purposes, from building stone to road metal. 



The Trenton here may be divided, on the basis of 

 fossils, into four zones, all of which can be traced from 

 Quebec to central New York and some of which are 



