56 



SECTION No". L— QUARRY AT PORT CREDIT (234 to 251) 



Humber Member: Thickness 



feet 

 In descending order: — 



(3) Grey to blue, fissile shales with limestone bands near the top. 

 Sandy layers in places. In the limestone bands the following fossils occur: 

 Zygospira erratica (abundant), Zygospira modesta, Rafinesquina mucronata 

 torontonensis (abundant), Byssonychia radiata, Modiolopsis concentrica, 

 Whiteavesia pholadiformis, Ctenodonta filistriata, Whitella cf . torontonensis, 

 Whitella cf. hindi, Modiolopsis posplicata, Pterinea demissa, Lophospira sp., 

 Glyptocrinus sp., Isotelus sp 5 



(2) Grey, unfossiliferous, fissile shale with a few bands of impure 

 argillaceous sandstone and one band of limestone with Byssonychia 

 radiata, Modiolopsis sp., Isotelus (fragments), Zygospira modesta .4 



(1) Grey, unfossiliferous shale with a few bands of hard, argillaceous 

 sandstone, extending to the bottom of the quarry which is 12 feet below 

 the level of Lake Ontario. In one band of limestone six feet above the 

 bottom of the quarry, the following fossils were found: Zygospira erratica 

 (abundant), Rafinesquina mucronata torontonensis (abundant), Zygospira 

 modesta, Ischyrodonta cf. unionoides, Byssonychia cf. radiata, Modiolopsis 

 sp., Pterinea demissa, Whiteavesia pholadiformis, Orthoceras lamellosum . . . 8 



The bottom of Section No. 1 is at the same level as the top of the section,, 

 exposing the highest strata of the Dundas formation east of the Credit river, 

 namely, the Prison quarry at New Toronto. The Humber member as seen in 

 the quarry at Port Credit is, therefore, the immediate upward extension of the 

 Humber member as seen in sections east of the river. 



SECTION No. 2.— LAKE SHORE 100 YARDS SOUTH OF SECTION No. 1 (246 to 256) 



Humber Member: Thickness 



feet 

 In descending order: — 



(2) Brownish to black shale, badly weathered at the top, fresh at the 

 bottom, containing abundant specimens of Cuneamya scapha brevior; 

 also: Stigmatella catenulata (var. B.), Glyptocrinus (columnals), Licheno- 

 crinus (columnals), Rafinesquina mucronata torontonensis, Byssonychia sp. 4' 



(1) Limestone with very numerous specimens of Zygospira erratica 

 and Rafinesquina mucronata torontonensis. The level of Lake Ontario is 

 taken as 246 feet above sea-level 6 



SECTION No. 3.— EAST SIDE OF CREDIT RIVER, ONE MILE NORTH OF PORT 



CREDIT (247 to 275) 

 Humber Member: Thickness 



feet 

 Grey fissile shale with bands of argillaceous sandstone varying from 

 one-half to three inches in thickness, unfossiliferous for the most part, but 

 13 feet above the water level, a limestone band contains the following 

 fossils: Zygospira erratica (abundant), Rafinesquina mucronata toronto- 

 nensis (abundant), Zygospira modesta, Byssonychia sp., Pterinea demissa, 

 Orthoceras sp., Isotelus (fragments). The fossiliferous band represents an 

 upward extension of the fossiliferous zone of the Humber member, while 

 the upper 15 feet is part of the unfossiliferous zone of the Humber member. 28 



SECTION No. 4.— EAST SIDE OF RIVER, TWO MILES NORTH OF SECTION No. 3 



(315 to 335) 

 Humber Member: Thickness 



feet 

 Grey, fissile shales with bands of argillaceous sandstone, but no lime- 

 stones and no fossils. The rocks of this section all belong to the upper 

 unfossiliferous part of the Humber member • • • • 20 



