I9I4-] CONCEPTION AND TRINITY BAYS, NEWFOUNDLAND. 375 



tween Holyrood and Manuels Brook. The newer or Great Intermediate 

 Series which flanks this Laurentian Nucleus, was found on the Peninsula 

 of St. Johns and Ferryland to show a general dip to the eastward although 

 making many minor undulations ; while on the Peninsula between Conception 

 and Trinity bays the inclination is reversed, being nearly uniformly westerly, 

 making many repetitions of the same strata however, as on the opposite side 

 of the fold. Corresponding with this great anticlinal, the measure of the 

 Intermediate rocks, as seen at parts of the eastern coast of Placentia Bay, 

 appear, by the generally eastern dip which they present, to indicate the axis 

 of a synclinal trough to run from Trinity Bay in the direction of St. Mary's 

 Bay." 



As structural work of a reconnaissance nature only has thus far 

 been published in reference to Newfoundland it is hoped that this 

 most interesting phase of geology of the island may be investigated 

 in the near future. The following locality descriptions will take up 

 briefly these smaller structural features which may serve as a clue 

 to the more general structures of the entire manganese area. 



III. GENERAL STRATIGRAPHY 



There is very little published information regarding the general 

 stratigraphy of the region under consideration but a few observations 

 made while studying the individual manganese deposits and other 

 information verbally communicated by Prof, van Ingen may be of 

 interest at this point. 



One of the most striking features of the manganese deposits is 

 their occurrence at the same horizon in shales of late lower Cam- 

 brian age at widely separated points on Conception and Trinity Bays. 

 At each deposit, the manganese zone was found to occur below the 

 Paradoxides zone. At Manuels in the shales directly below the man- 

 ganese nodular beds, heads of Protolenus harveyi (oral communica- 

 tion by G. van Ingen) were found so that in all probability the man- 

 ganese beds may be included in the Protolenus zone of Matthews 

 (16:101-153). 



By referring to the columnar sections (Figs. 2, 36, 42, and 44) it 

 is readily seen that the sediments consist largely of shales and lime- 

 stones and that there is a very decided increase in the total thickness 

 of the beds from Manuels where there are 215 feet between the 

 bottom of the Paradoxides zone and the top of the pre-Cambrian to 

 Smith Point, Trinity Bay, where over 1,000 feet intervene between 



PROG. AMER. PHIL. SOC. , I.IV. 220 Z, PRINTED FEBRUARY 23, I916. 



