Pat 
ations described have au aggregate thickn 
5 A eat ae eh ly pele Sasa as peg a RS A es PEST soos e a Ca ie i eas eee ae 
ARS aoe te aba 
Pease TE A = Senge cee pot ae are Senet Ee eee a ae WU eae 
porate a 
portance. 
2 freezing point. A detachment with sledges 
ao 
Bea i 
1876] Geology and Palæontology. 751 
weight to the arguments already adduced to this effect. But the change 
from the fauna of the- underlying cretaceous numbers four and five is 
_ very striking, the genera and often higher groups being quite different. 
The types of the marine beds were found to be Pythonomorpha, Elas- 
mosaurus, Plesiosaurus, Enchodus, chimerids and sharks, with marine 
Cephalopoda, etc. Nevertheless the physical transition between the 
marine and lacustrine formations appears to be complete, as indicated by 
Professor Hayden. 
POWELL’S GEOLOGY or THE UINTA Mountains. The field work 
reported on by this important volume was done between the years 1868 
and 1875, among the Uinta Mountains and adjacent regions, covering 
saga of Wyoming south of the Pacific Railroad and of Utah. This 
pets of great general geological interest, and its geology has been 
discussed by Major Powell in an able and original way. Particular at- 
tention has been paid to facts relating to mountain-building, the amount 
of denudation and displacement of strata in these mountains being fully 
Ricisted and. graphically represented The Bick skye View orama 
of the Uinta Uplift, in the atlas, well illustrates the author’s manner 
of representing the orography of an extensive plateau area. The for- 
ess of fifty thousand feet, and 
and cenozoic age. The palæon- 
The geological maps 
of much practical im- 
_” groups of palzozoic, mesozoic, 
“ud has been elaborated by Dr. C. A. White. 
and sections are of a high degree of interest and 
GEOGRAPHY AND EXPLORATION. 
Rerory or THE British ARCTIC Exprepition. — The following 
note is condensed from the newspaper reports. The British Arctic 
tition under Captain Nares returned to England, October 27th. 
Ee and Discovery left Fort Foulke on July 29, 1875, and entered 
e ice off Cape Sable. After a severe and continuous struggle they 
reached the north side of Lady Franklin Bay, where the Discovery was 
left Mm winter quarters. The Alert pushed on and reached the limit of 
Navigation on the shore of the Polar Sea. The ice varied in thickness, 
a ing in some places one hundred and fifty feet thick. President Land 
oes not exist. ; 
_ The Alert wintered in latitude 82° 27. At this point the san wat 
invisible one hundred and forty-two days, and a temperature the lowest 
ever recorded was experienced, being fifty-nine degrees, below zero for 
a fortnight, and falling once to one hundred and four degrees below the 
Tt was absent seventy days, and reached latitude by 
Party rounded Cape Columbia, the northwest point © a 
ig two hundred and twenty miles westward from Greenland, and 
explored far to the eastward. ; ae 
a" on the Geology of the Eastern Portion of S Uinta Monan Ta 
1876 i f Country adjacent thereto. With Atlas. By J. W. Powell. 
p> pp. 218 
