346 Hails Second Arctic Expedition. [May, 
and cream-colored dolomites and limestones, and a few pieces of 
black cherty and dark fissile limestones, which furnished so many 
fossils new in these regions, and coming from a horizon which 
had not before been known to be represented so far north—that 
of the Utica slate.” * * * “The geological collections made by 
Aurora sketched by Hall. å 
him [Hall] give us the only information concerning the occur- 
rence of the Lower Silurian in the whole of Arctic America, 
north of Rupert's Land, with the single exception of the fossils 
collected by Capt. McClintock and described by Houghton. 
These latter were brought from North Devon, Bellots straits and 
