LOWER CAMBRIAN TERRANE 329 



the strata of the Hanford terrane beneath the quartzite results 

 from non-deposition is more satisfactory than the view that the 

 strata were originally deposited and subsequently removed by 

 erosion. 



Unconformable Overlap of Cambrian in JVezv/oundland. — 

 Various Cambrian sections on Trinity and Conception Bays 

 prove that the outlines of the bays existed in Algonkian time, 

 and that the Cambrian sediments were deposited within and 

 about the bays on an uneven surface of Algonkian rocks. In 

 some instances the contact between the Cambrian and the Al- 

 gonkian shows the same dip and strike, but in other instances, as 

 at Manuels Brook and other points on Conception Bay, there is 

 a great unconformity between the two. 



I do not think that the Cambrian rocks were extensively 

 eroded at any period during their deposition. In ever}^ section 

 examined where there was no disturbance of the strata by in- 

 trusive rocks there was conformity throughout the Cambrian 

 section. 



Taking the massive Smith Point Hyolithes limestone as the 

 datum line, the following sections show the thickness to the 

 point of contact with the subjacent Algonkian Random terrane : 



Feet. 



Smith Sound (no contact) 441 + 



Random Sound (contact) 516 + 



Hearts Delight (contact) 155 



Spread Eagle Point (contact), est 100 



Manuels Brook (contact) 35 



Mr. Matthew, in his diagrammatic figure of a section of the 

 Eopaleozoic at Smith Sound, ^ indicates an unconformity be- 

 tween the Etcheminian and the Cambrian 'Protolenian ' horizon. 

 Mr. Howleyand I studied this portion of the section very carefully 

 and we failed to find any evidence of an unconformity. There 

 is a conglomerate, as described by Mr. Matthew, but it is of an 

 intraformational character, such as occurs in the Cambrian at 

 other localities and horizons in Newfoundland. This conglomer- 

 ate serves well to mark the base of the Middle Cambrian. At the 

 point of exposure on the shore there is a vertical fault cutting 



iLoc. cit., Fig. 3, p. 48. 



