THE ACADIAN TRIASSIC 13 



The structure of the Quaco area is synclinal, with an east-west 

 axis (Figs. 7 and 8). The contact of the Newark rocks with older 

 rocks is shown at West Quaco, where there is an unconformity of 

 red Triassic sandstone on greatly pointed, pre-Triassic traps. 

 The basal sandstone contains occasional pebbles of various kinds 

 of rock but contains no residual soil of the trap. At the uncon- 

 formity there is minor cross-faulting in a northeasterly direction. 

 At Melvin's Beach, on the northeast, the Triassic sandstones are 

 seen, with steeply dragged dips, in fault-contact with pre-Cambrian 

 metamorphics. 



The stratigraphy of the area shows two normal red sandstone 

 members, separated by a conglomerate of pale yellow color. Inter- 

 bedded in the conglomerate are persistent beds of sandstone, a few 

 inches in thickness, at stratigraphic distances of 10-30 feet, as 

 shown in Fig. 8. The conglomerate is composed of rather loosely 

 consolidated subangular to rounded stream gravels. Many of the 

 pebbles show impressions of one pebble into another, and other 

 recemented fractures. 1 In no other locality of the Acadian Triassic 

 is such a conglomerate found. 



The section was estimated as follows : 



Upper red sandstone 800-1,000+ 



Quaco conglomerate 45°- 700 



Lower red sandstone 300- 300 



1,550-2,000 



UNCONFORMITY WITH CARBONIFEROUS 



Plant remains occur at several horizons in the Quaco series. 

 Silicified wood was found by the writer within 50 feet of the top 

 of the lower red sandstone, at Vaughan Creek, and by members 

 of the Geological Survey of Canada at other localities. These 

 fossils are correlated with the fragments of lignite from Split Rock 

 and Martin Head. On account of the exposure of the basal uncon- 

 formity of the Newark at West Quaco, it is probable that the 

 Quaco exposure is to be correlated with the Annapolis formation, 



1 These conglomerates are similar to those of Upper Devonian age on the north 

 side of Scaumenac Bay, Province of Quebec, described by J. M. Clarke, Bull. Geol. 

 Soc. Am., XXVI (1915). 



