Pro/. Nordenslddid — ExjoediUon to Greenland. 



449 



In conclusion, I may add that Mr. Orton has submitted to me 

 a beautiful specimen, apparently of the Tentaculites tenuistriata of 

 Messrs. Meek and Worthen, also from the Cincinnati groiap of South- 

 Western Ohio. If this specimen be rightly determined, I cannot 

 avoid the conclusion that it is truly referable to the genus Gornulites 

 of Schlotheim — differing from the familiar Cornwlites serpularius in 

 its small size, and in some other minor characters. This conclusion, 

 however, does not admit of complete verification except by the 

 discovery of specimens absolutely attached to some foreign body. 



V. — Account of an Expedition to GtReenland in the tear 1870. 



By JProf. A. E. Nordenskiold, 



Foreign Correspondent Geol. Soc. Lend., etc., etc., etc. 



Part IV. 



(Continued from page 427.) 



SOMEWHAT further to the west of 

 Karsok, and about 50 feet higher 

 up, occurs another similar stratum, 

 containing a mass of graphite, so soft 

 that it may be cut with a knife. This 

 spot was not, however, accurately ex- 

 amined. A similar stratum of graphite 

 imbedded in sand and clay occurs also 

 at a very great height above the sea at 

 Niakornet, but time did not admit of 

 our visiting that spot. 



The graphite from Karsok is per- 

 fectly compact, without any signs of 

 cleavage. On being heated, some pieces 

 decrepitate violently and yield water. 

 An analysis by Dr. Nordstrom gave : 





I. 



II. 



III. 



Carbon 



. 93-70 . 



. 95-68 . 



. 95-42 



Hydrogen .. 



. 0-69 .. 



. 0-22 . 



. 0-27 



Ash 



. 4-92 .. 



. 3-60 . 



. 3-60 



99-31 



99-50 



99-29 



Part of the loss was probably oxy- 

 gen. The ash contained per-oxide of 

 iron, alumina, and 50 per cent, of silica ; 

 so that even these analyses indicate 

 that this mineral is much nearer pure 

 graphite, with which it fully agrees 

 in appearance, than the coal that is 

 usually found in these formations. 



In the strata belonging to this divi- 

 sion we found plant-remains at the 

 following places : — 



1. Ekkoi'fat. — The strata here rest 



VOL. IX. — NO. c. 



i-iyy>iy.xx>:X.KX*x 



yxxxxxx-yxxxxxits 

 xxxxxxxxxxxxxX;^* 

 cxxjfifxvxy J^^txXJi 

 xxyxxxxxx*vxxxx> 

 xxxyxxxxxvxxxxJO 

 xxxxxx>xxxxxxxxi< 



Fig. 9. Succession of 

 strata at likliorfat. 



29 



