Professor Emerson on lialVs Geological Collections. bl'6 



The hornblende is for the most part deep green. Some crystals are reddish at 

 one end, colorless in the middle, and green at the other. They show cross sections 

 of 124°. Diallage in pale yellow crystals, with characteristic inclosures, i>lagioclase 

 in one or two large crystals and orthoclase grown fibrous from decomposition were 

 also present. 



105. Trap GrRANULlTE. 



This is a fresh fine-grained piece of the same rock, which shows a distinct 

 separation into plates half an inch thick by a rude cleavage, which is not accom- 

 panied by any parallelism in the arrangement of the constituents. Under the 

 microscope it shows all the minerals mentioned under the last rock described, and 

 the resemblance is so close as to render a special description superfluous. 



106. TRAP-aRANTJLITE. 



This piece is very much weathered, of a light chocolate color, mottled with 

 large spots of a whitish substance, filled with blackish and greenish grains. The 

 colorless spaces prove in their section to be amygdaloidal cavities, filled with an 

 outer layer of milk-white zeolite and an inner layer of quartz ; both are filled with 

 scales of viridite. The rest of the mass is much decomposed, but seems to have 

 been originally the same as those above described. 



107. TRAP-aRANULITE. 



A small much weathered i)iece. 



Labeled, " Found on the route between Eescue Harbor and Or-pung-ne-wing, 

 an island in Frobisher Bay. C. F. Hall." 



SEDIMENTARY ROCKS. 



108. Sandstone. 



A slab 12 by 15 inches, of a medium-grained rusty -brown flagstone, the sur- 

 face covered with ripple-marks 25 mm. apart. The crests of the ripple-marks are 

 weathered ocher yellow. 



Labeled, " Sandstone, with ripple-marks. Lupton Channel. Silurian." 



The following extracts from Hall's Narrative refer to this rock: "On arriv- 

 ing at the next place of encampment, the last before reaching the harbor, where 

 I had left the ship, the Innuits informed me that it was called Shar-toe-wik-toe, 

 from a natural breakwater of thin or plate stone, the native word meaning " thin, 

 flat stone." It is on a tongue of land nearly surrounded by water, on the west side 

 of Lupton Channel." (p. 439.) 



Hall also mentions that as he stopped in Lupton Channel on his way home, 

 an old Innuit woman brought on board as a present a fish upon a slab of red 

 sandstone. 



