306 H. M. AMI — KNOYDART FORMATION OF NOVA SCOTIA 



and marine limestones and gypsum, designated (in part at least) by the 

 writer, as the Hopewell formation.^ 



(c) The so-called '• Millstone Grit " series, for the most part very flat 

 lying and undisturbed, showing that the physical disturbances and 

 agencies to which the Silurian and Devonian strata have been subjected 

 which have dislocated and tilted their strata had disappeared j)revious 

 to the time when these Carboniferous grits were laid down. This so- 

 called " Millstone Grit " series, which is very doubtfully the equivalent 

 of the true " Millstone grit " of England, was designated by the writer 

 as the Westville formation, on page 178 of the paper cited above, in order 

 to separate it from other formations in the district. 



Fletchers Section of the Knoydart Formation along McAkras 



Brook 



In 1897 Mr Fletcher made a careful renieasurement of the red marls, 

 sandstones, shales, and calcareous bands holding fish remains along the 

 valley of McArras brook, a copy of which was kindl}'' furnished me by 

 him with the sanction of Doctor Dawson, director of the Geological 

 Survey. In order to give the reader more detailed information on the 

 succession of the strata in this bit of tlie " Old Red Sandstone " his 

 valuable section has been incorporated in this paper. 



From the mass of trap near the mouth of McArras brook the follow in<>; is the 

 section in ascending order: 



\-\'vt. Indies 



Amygdaloidal trap, probably Lower Carboniferous, as describi'd 

 in Report P for 1886. 



Measures concealed. On the left bank of the brook trap is in the 

 cliff, while on the right l)ank there are indications of red strat- 

 ified Devonian rocks -50 



1. Red, argillaceous shale, more or less slaty, with coherent under- 



day full of rootlets, dip nortli 2;>0 degrees angle 'A'2 degrees 



(magnetic) •> 



2. Red, argillaceous, slaty rock, not well seen 4 



3. Red, broken, argillaceous shale, with greenish and gray blotches. (> 



4. Red shale, nearly all concealed (> 



5. Red, very coherent, concretionary, calcareous rock at the mouth 



of a little brook from the eastward 1 6 



6. Red, argillaceous shale 7 6 



7. More coherent, flaggy rocks, which may be called sandstone 1 



8. Red, argillaceous shale 8 



9. Red, coherent, somewhat sandy flags, in two layers 3 



10. Red, argillaceous shale, in part blotched with green 46 



*Proc. and Trans. Nova Scotian Inst. Sci., vol. 10, pt. 2, Halifax, 1900, p. 177. 



