LOWER CAMBRIAN TERRANE 313 



il is probably representative of the conglomerate le at base of the 

 Middle Cambrian of the Smith Sound section. Above this the green- 

 ish shales extend a considerable distance, but they are broken and 

 more or less covered by drift. 



Su mmary of Hearts Delight Ha7-bor Section^ doivntvard. — 



Feet. 

 From Middle Cambrian conglomerate il to Hyolithes 



limestone 330 



Hyolithes limestone 28 



Hyolithes limestone to base 155 



Dildo Harbor Section. — At the point on the south side of 

 Dildo Harbor the lower portion of the Cambrian section is ex- 

 posed, where it rests on the sandstones of the Random terrane. 

 The Smith Point Hmestone is much broken up. In one of the 

 upper beds Coleoloides typi'calis, numerous sections of Hyolithes, 

 and fragments of trilobites, including Oletiellus, were noted. 



CONCEPTION BAY. 



Manuels Brook Section. — At Manuels Brook, above the rail- 

 road bridge, the ledges of gneiss that form the bed of the river 

 were referred to the Laurentian by Mr. Alexander Murray.^ 

 The examinations made by me in 1899, in company with Mr. J. P. 

 Rowley, proved that this gneiss is intrusive in the lower portion 

 of the ' Huronian ' of Murray, or the Avalon series as then de- 

 scribed.^ The gneiss at this point formed a headland in the early 

 Cambrian sea, about which the waves gathered a coarse con- 

 glomerate, which now forms several beds, aggregating 35 feet 

 in thickness, at the base of the Cambrian. A few miles to the 

 southwest, at Red Rock Point, Chapel Cove, near Holyrood 

 Point (see page 317), the basal bed of the Cambrian is a fine- 

 grained sandstone 6 feet in thickness, resting on altered basalt 

 that cuts through the Random terrane of the Avalon series. Im- 

 mediately southwest of Manuels, along the line of the railway 

 track, the basal beds of the Cambrian are exposed for a dis- 

 tance of 2 miles or more, sometimes as conglomerate with pur- 

 ple shales above, at other times as nodular limestones interbed- 

 ded in the reddish-purple shales with greenish shales above. 



' Map of the Peninsula of Avalon, 1881. 

 •Bull. Geol. Soc. Am., Vol. X, p. 218. 



