ETHERIDGE, ROCK SPECIMENS. 541 



LXXXIII. — Notes on some Rock- Specimens from tlie 

 Arctic- American Archipelago, by E,. Etheridge, 

 Esq., F.RS. In the " Whaling Cruise to Baffin's Bay 

 and the Gulf of Boothia, and an account of the 

 rescue of the crew of the ' Polaris' ; " by Albert 

 Hastings Markham, Commander, R.N. F.R.G.S., 

 1874. 8vo., London. 



Appendix C. List of the Geological specimens collected by 

 Captain H. Markham, R.N., F.R.G.S., and examined by R. 

 Etheridge, Esq., Museum of Practical Geology. 



IJpERNAViK. — I. Syenite, much resembling the Laurentian* 

 series of Cape Wrath (Sutherlandshire). 2. Crystals of felspar, 

 also like those in the Sutherlandshire rocks. 3, 4. Quartz-rocks. 



Elwyn Inlet. — Piece of quartz-rock and quartzite. 



Cape Hay. — Two pieces of limestone, extremely like that of 

 Durness in N.-W. Sutherlandshire, of Llandeilo age (Lower 

 Silurian). Two specimens of Saxicava rugosa, from 150 feet above 

 the sea-level. 



Navy-Board Inlet. — Specimens of " fundamental gneiss," like 

 that of Cape Wrath ; hornblende-rock, mica-schist, quartzite, and 

 magnesian limestone. 



Port Leopold. — Syenite, felspar, and quartz, like the Cape 

 Wrath rocks. An alternation of limestone and sandstone pro- 

 bably Silurian. Gneissose rocks, much the same as the "funda- 

 mental gneiss " of N.W. Sutherlandshire. A specimen showing 

 Annelide tracks in fine-grained sandstone. 



Fury Beach. — Specimens of gneiss, hornblende, quartz, and 

 gneissose rocks, much like the " fundamental series " of Suther- 

 landshire. Argillaceous limestone, with the following fossils of 

 Upper- Silurian age : — Favosites (two specimens) ; Athyris (two 

 specimens) ; Holopella. 



Cape Garry. — Hornblende ; quartz-rock, stained red ; crystals 

 of calcareous spar ; concretionary limestone. Limestone contain- 

 ing several fossils of uncertain age. Chonetes and Terebratula of 

 the Upper-Silurian age. 



Several of the specimens, having been picked up on the beach, 

 are much waterwoi'n. 



* The occurrence of rocks referable to what are now known as Laurentian 

 is noticeable also in Macculloch's list of Ross's Specimens, above, p. 324. 

 Piugol's Igalliko quartzite and some of the quartz-rocks of the above list may 

 be of the succeeding Cambrian age. — Editor. 



