468 A. F. BUDDINGTON 



The conglomerate outcrop near La Manche, and the pebbles, 

 are all of volcanic rocks such as basalt, basalt porphyry, rhyolite 

 porphyry, felsite, etc., imbedded in a matrix showing innumerable 

 flashing cleavage faces of white plagioclase. 



Since these beds in their well-bedded and unoxidizqd characters 

 give evidence of their being deposited beneath a permanent water- 

 level, and since they consist almost exclusively of materials similar 

 to the rocks comprised within the underlying volcanic series of 

 subaerial origin, it is probable that an unconformity exists between 

 the Conception slate series and the Avondale volcanics, and that 

 the former are derived from the latter, at that time a more or less 

 loose accumulation of volcanic ash and breccias which were swept 

 into the sea in a comparatively fresh and undecomposed condition. 



TORE AY SERIES 



The Torbay series was not studied by the writer. Murray's 

 description of it is inserted here for completeness: 



Green, purple, pinkish, or red slates in frequent alternations; the texture 

 of these slates is generally extremely fine, and in some cases they approach in 

 hardness to jasper or chert. The fracture is often conchoidal, and the imperfect 

 cleavage parallel with the bedding; but in many instances the rock has a good 

 cleavage at right angles to the stratification and is well adapted for roofing 

 purposes. The exposed surfaces weather for the most part a yellowish white. 



Some beds seen by the writer on the Isthmus of Avalon strongly 

 resemble banded argillites; cobbles of green and red argillite were 

 also found in the drift of the St. John's Peninsula, presumably 

 derived from the Torbay series. 



MOMABLE SERIES 



These beds are described by Murray (1881, p. 145) as follows: 



Dark brown or blackish slates of St. John's, with ripple marks very dis- 

 tinctly displayed on some surfaces, and in which some obscure organic remains 

 have been found resembling those found in c^ and another supposed to be the 

 shelly casing of some description of Annelid. The cleavage of this slate is 

 sometimes very regular, oblique, or at right angles to the bedding, but in parts 

 it also cleaves parallel with the stratification. Towards the top are frequent 

 layers of hard, fine-grained, greenish sandstone inters tratified, not usually over 

 6 or 7 inches in thickness. 



