94 The American Geologist. February, 1905 
figures. List appended is nearly tlie same as one in Proc. Amer. 
Assn. Adv. Sci. 
1850. List of Tennessee Crinoids. Jahrb. fur Min. &c Jahrg. 
1850, pp. 376-377. 
1850. List of Tennessee Crinoids. Jahrb. fur Min. &c Jahrg. 
Assn. Adv. Sci., vol. 2, pp. 59-62, 1850. 
List gives 88 new species and 16 new genera, all being Silurian. 
1850. Monograph on Crinoids (?) discovered in the state of 
Tennessee by Dr. G. Troost. Ms. in U. S. National Museum. 
Vanderbilt .University. 
NOTES ON SOME ROCKS AND MINERALS FROM NORTH 
GREENLAND AND FROBISHER BAY. 
By B. K. Emerson, Amherst, Mass. 
PLATE VI. 
Introduction — A large box of rocks collected by Mr. I. 
I. Hayes, at and around Port Foulke* came into the posses- 
sion of the Amherst College cabinet, presented by professor 
Edward Tuckerman, to whom the box was sent by Dr. Tor- 
rey because of the lichens with which the rocks are covered. 
From the scattered notices in the account of Dr. Hayes' 
expedition it is clear that the Archaean rocks of the moun- 
tain ridges are flanked along the eastern shore of Smith's 
sound by an extensive series of sandstones and limestones 
cut by heavy dykes of dark igneous rocks. 
The rocks examined are without especial labels except 
one upon which is written, "Picked up by Jensen while oflf 
on a hunt after reindeer," but I am quite sure that the 
pieces described below came from the near vicinity of the 
winter quarters of the expedition at Port Foulke, both from 
their large size, and the great number of pieces of the same 
rock present, and from the fact that I have for comparison 
rocks from Etah bay, Sontag's grave, and all the other local- 
ities in the neighborhood mentioned in Dr. Hayes' narrative, 
which with full labels affixed were found in a box of rocks 
packed by the Arctic explorer. C. F. Hall in Kotzebue 
*The Open Polar Sea. ISGi 
