57 



SECTION No. 5.— SOUTH SIDE OF RIVER, ONE-HALF MILE DOWNSTREAM FROM 



SECTION No. 6 (335 to 395 ?) 

 Humber Member: Thickness 



feet 

 Almost entirely shale, brown to black in colour, with a few bands 

 of argillaceous sandstone. The shale is rubbly and looks inviting to 

 the collector, but nothing but an indeterminable species of Byssonychia 

 was found. Sixty feet above the water-level, there are some limestone 

 beds, containing Hebertella occidentalis, which judging by the dip of the 

 strata probably correspond to the rocks in Section No. 7 (Credit member), 

 which also contain Hebertella occidentalis 60 ? 



SECTION No. 6.— ON A SMALL CREEK EMPTYING INTO THE RIVER FROM THE 

 SOUTHWEST, ONE-HALF MILE SOUTH OF ERINDALE (360 to 400) 



Credit Member: - Thickness 



feet 

 In descending order: — 



(2) Shale and argillaceous sandstone with no limestone and no fossils. 30 



(1) Shale and argillaceous sandstone as' above, but with a few lens- 

 like layers of limestone containing numerous fossils. One of these beds, 

 eight feet above water-level, is remarkable for the abundance of large 

 fragments of Isotelus cf . maximus contained in it and for the abundance 

 of Stigmatella sessilis crassa usually covering the fragments of the fore- 

 going trilobite. This upper bed also contains: HaUopora onealli credi- 

 tensis, Zygospira modesta, Byssonychia cf. praecursa, Pterinea demissa, 

 Whiteavesia pholadiformis, Whitella cf. hindi, Modiolopsis borealis, Cyma- 

 tonata cf. lenior, Ischyrodonta unionoides, Modiolopsis sp., Byssonychia 

 radiata, Actinoceras crebriseptum, crinoid columns. Another bed three 

 feet above the water-level yielded: Zygospira modesta, Clidophorus, 

 planulatus, Modiolopsis concentrica, Byssonychia sp., Isotelus cf. maximus, 

 Stigmatella sessilis crassa 10 



SECTION No. 7.— EAST SIDE OF RIVER OPPOSITE MOUTH OF MULLET CREEK 



(370 to 390) 

 Credit Member: Thickness 



feet 

 Brownish to black shale with bands of argillaceous sandstone with 

 fucoids and ripple marks. At a height of four feet above the water-level, 

 a four-inch band of limestone contains: Zygospira modesta, Byssonychia 

 radiata, Modiolopsis sp., and fragments of Isotelus. Six feet above the 

 water level, another band of limestone contains a few specimens of 

 Hebertella occidentalis, one small specimen of Stigmatella sessilis crassa, 

 and numerous fragments of Isotelus. The upper unfossiliferous shales 

 belong to the barren zone marking the boundary between the Dundas 

 and the Richmond formations. The lower part, with fossils, is a con- 

 tinuation of the lower fossiliferous zone of the Credit member, as seen in 

 Section No. 6 20 



SECTION No. 8.— MULLET CREEK (410 to 450?) 



Upper Erindale: Thickness 



feet 

 In descending order: — 



(6) Grey to brown and black fissile shale with bands of argillaceous 

 sandstone, unfossiliferous 20? 



Zone of Strophomena varsensis: 



(5) Crystalline limestone, characterized by the abundance of Stropho- 

 mena planumbona erindalensis and Strophomena varsensis. The elevation 

 of the under side of this layer obtained by wye level is 401.19 feet above 

 sea-level. Heterotrypa cf. subfrondosa, Heterotrypa definita, Catazyga 

 headi, Hebertella occidentalis, Rafinesquina alternata, Zygospira modesta, 

 Byssonychia sp., Isotelus sp., Conularia sp. also occur V2 



