BY W. K. BENSON. 575 



stone, red, pink, or grey in colour, and horny or crystalline in 

 texture, intermingled with angular blocks of red or green felsite," 

 which, on microscopical examination, proves to be keratophyre 

 or spilite, as the writer understands, is also the case with so- 

 called felsite at Tourmakeady (see 20). "The matrix, in which 



these blocks are embedded, is a calcareous ashy grit." 



The writer has " found no fossils in the matrix, although some of 

 the included limestone blocks have yielded a rich harvest of 

 fossils." The mass of limestone in Beedle's Freehold, Portion 

 163, Nemingha, is of this character. As in the case of the rocks 

 described by Messrs. Gardiner and Reynolds, so here, "it seems 

 impossible to avoid the conclusion that, after the deposition of 

 the fossiliferous limestone, it was in some cases broken up by 

 volcanic eruptions, and the fragments, accompanied by fragments 

 of felsite, were embedded in a tuff which thus must be of later 

 date than the limestones. It does not, however, follow that 

 there was any very great interval of time between the deposition 

 of the limestone, and its disruption, succeeded by the embedding 

 of its fragments in a coarse tuff. . . . The view of the explosive 

 origin of the limestone-breccia affords an adequate explanation 

 of its patchy mode of occurrence." The writer cannot find words 

 more appropriately descriptive of the brecciated limestone of the 

 Nemingha horizon than those used by the authors cited. 



One would naturally expect that brecciated cherts and clay- 

 stones should occur in an analogous manner, either with or with- 

 out intermingled tuff. Such rocks are well developed in the 

 Middle Devonian Series west of the serpentines in Spring Creek, 

 and are particularly abundant in the Eastern Series on the 

 opposite side of the valley, which rocks are considered to be an 

 infolded repetition of portion of the Middle Devonian Series. 

 It is not necessary to describe these in detail; they are naturally 

 connected by intermediate types with those described above 

 (p.571). 



There remain to be considered the more massive intrusive 

 rocks. One of these is a porphyrite, the phenocrysts of which 

 are greatly shattered, though the rock appears to be massive 

 This forms a small mass in Portions 213, 214, or 216, Parish of 



