1883. 13 Trans. N. Y. Ac. Sci. 
nolite or byssolite, and containing glittering rows of small cavities filled 
with liquid. It was only valuable as a mineralogical specimen for 
cabinet purposes, and was worth for such use about $5. 
Mr. KunzZalso reported on the ‘‘Georgia Marvel,” or the ‘‘ Blue Ridge 
Sapphire,” as it is called, which was found a little over a year ago ina 
brook in that State. The stone weighed about half an ounce, and was 
supposed to be worth about $50,000. Its discovery created even more 
interest than did that of the North Carolina emerald. Two well-known 
Southern jewellers asserted that it was genuine, and it was sent here 
for a crucial test. Mr. KUNZ said that after a short examination he 
found it to be a piece of blue bottle-glass, which had been rolled in the 
brook until the action of the water and gravel had polished it to un- 
usual brilliancy ; and he was obliged to glaze or enamel a piece of 
platinum wire with a fragment of the ‘‘ sapphire” to convince the 
owner that it was glass. 
He also exhibited fine crystals of limpid topaz, from Pike’s Peak, 
Colorado, said to have been found inassociation with the amazon-stone 
and phenakite of that locality. 
Dr. NEWBERRY exhibited and gave some description of a large col- 
lection of typical fossil fishes and leaves gathered by Mr. WILSON 
from the Central Rocky Mountains, at a locality about seventy miles 
north of the Union Pacific Railway, near Green River, Colorado. 
With these were associated a few fossil plants, including a fan palm, 
and many insects. They occurred in a fresh-water shaly limestone of 
Eocene age, occupying a part of the Green River basin, the whole 
formation being 2,500 feet in thickness. 
In reply to an inquiry by Prof. MARTIN, he further stated that the 
insects found in the deposits at Florissant, Col., are more recent ; 
these also include two species of birds, many plants, etc., which are 
evidently of later date than the fossils on exhibition. 
Dr. N. L. Britron then spoke on the subject of 
NOTES ON THE COPPER MINING REGION OF LAKE SUPERIOR. 
The succession, probable stratigraphical relationship, and lithological 
characteristics of the rocks and veinstones of the region were described 
in detail, and illustrated by diagrams anda series of specimens col- 
lected during a visit of the past summer. 
DISCUSSION. 
Prof. O. P. HUBBARD stated that the first steamboat which navi- 
gated Lake Superior was drawn across the straits at the Sault in the 
year 1849. It was curious that this date was preceded in Russia, since 
the first steamboat navigated Lake Vega in the year 1842. 
