238 THE CANADIAN NATURALIST. [Vol. viii. 



coastline; and before Christmas, all the coastal waters within 

 the zone of Islands are frozen in one solid sheet, so that no 

 11 Ice foot" is formed on the Labrador like the w Ice foot" on 

 the Greenland shores. In brief, it may be said that the stupend- 

 ous work of Ice on the Labrador, apart from Glacial Sculpturing, 

 appears to be almost altogether due to the periodical action of 

 pan ice, deriving its power and constant opportunities, from the 

 Arctic Current which presses continually on the Labrador Coast. 



THE LAURENTIAN SERIES. 



9. — Crystalline Limestones. 



The occurrence of Upper Laurentian Rocks on the Labra- 

 dor Coast has long been known, and their approximate limits 

 are laid down on a map which was published some years since in 

 Petermann's Mittheilungen, the data being chiefly derived from 

 the observations of the Moravian Missionaries. The area occu- 

 pied by the Upper Laurentian on this extensive coast is repre- 

 sented to be very considerable, and that it extends far back into 

 the interior is probable from the fact that in 1S61 I found 

 Labradorite rocks on the Upper Moisie River, the locality being 

 represented on Sir W. E. Logan's Geological Map published in 

 1864.* 



During the last summer (1876) I met with a thin band of 

 Crystalline Limestone about 35 feet in thickness in Hamilton 

 Inlet, at the place called Mullen's Cove. 



Mullen's Cove is situated eleven miles due East from Rigou 

 lette, the Hudson Bay Company's Post, and its position is 

 shown on the Admiralty Chart of Labrador by Commander 

 Maxwell, R. N., published 10th July, 1876. 



With a view to illustrate the regularity and variety of the 

 strata in the vicinity of the Crystalline Limestones, the follow- 

 ing section was roughly measured by my friend Mr. Colchester 

 and myself in August last, across the strata. 



The Series was well exposed on the Coast of Hamilton Inlet, 

 and offered unusual facilities for examination in detail. It- 

 includes at the summit a band of limestone before noticed, 

 also small bands of limestone from 4 feet to one inch in thick- 

 ness in No. XL 



* Vide page XII. Geology of Canada, 1863. 



