LOWER CAMBRIAN TERRANE 33 1 



erosion of still older Cambrian beds prior to the deposition of 

 the sediments now forming the base of the section at Manuels 

 and vicinity. At one point the basal bed may be the Smith 

 Point Hyolithes limestone resting on the conglomerate, and at 

 another point not far away a shale 50 feet, more or less, above 

 or below that limestone. Ten miles away, at Red Rock Point, 

 the basal conglomerate is absent ; a reddish-purple shale rests 

 on a band of fine-grained quartzitic sandstone, with a succession 

 of shales and limestones above for 200 feet, in which the 

 Olenelhis {H.) broggeri fauna occurs. It is to be noted that at 

 this point a massive bed of limestone, 170 feet above the base, 

 apparently represents the Smith Point Hyolithes limestone ; 

 and it must be recalled in this connection that there are no 

 nodular limestones above the Smith Point Hyolithes limestone 

 in the Smith Sound section, but that the nodular limestones 

 occur in the reddish-purple shales beneath that band of lime- 

 stone. That the section between the Hyolithes limestone and 

 the base of the Middle Cambrian is so thin at Manuels may be 

 owing to the elevation of the sea bed at this point after the dep- 

 osition of the limestone, or possibly to a fault that cuts out 

 more or less of the shales. Certain it is that the intervening 

 beds found on Trinity Bay are not present. This fact, and 

 the Protolenus-like aspect of the fauna, misled Mr. Matthew as 

 to the true statigraphic position of the fauna, as it is now known 

 from the unbroken Smith Sound section. 



Lower Cambrian Fauna. 



Mr. Matthew makes the following observations on the fossils 

 in the Basal series. In 1888 attention was called to the occur- 

 rence of several forms, and reference was made to the * Lower 

 Cambrian series ' as containing vestiges of organic forms. ^ Two 

 years later a measured section of the ' Basal Etcheminian ' 

 series was published, with an account of the fossils found at 

 various horizons in the 1200 feet of estimated thickness of the 

 series. As no subsequent account is given of this fauna, the 



' On a Basal Series of Cambrian Rocks in Acadia : Canadian Rec. Sci., Vol. 

 Ill, 1888, p. 27. 



