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558 The American Naturalist. [June, 
General Notes. 
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GEOLOGY AND PALEONTOLOGY. 
Oneonta and Chemung Formations in Eastern Central 
New York.—The Oneonta formation comprises a thick mass of red 
shales and red and gray sandstones, similar in character to the rocks 
of the Catskill Mountains. They overlie the Chemung formation in 
southern New York and northern Pennsylvania. The recent investi- 
gations of Mr. N. H. Darton confirm Professor Hall’s supposition that 
the Oneonta beds represent the eastern extension of the Portage forma- 
tion. The former is characterized by a large quantity of red shale 
which occurs as streaks in the lower beds, a thick mass a little higher 
in the series, and constitutes elongated lenses in the gray flags and red 
sandstones of the upper member of the formation. Toward the western 
termination of the Oneonta formation the red material rapidly disap- 
pears and its place is taken by gray shales and thin bedded sandstone, 
There can be no doubt of the continuity of sedimentation throughout. 
Toward the east the formation increases in thickness until it comprises 
the lower thousand feet of beds in the Catskill Mountains. The Che- 
mung fossiliferous shales which overlie the Oneonta formation south of 
Franklin grade upward through a series of flags into hard, coarse, 
cross-bedded gray sandstones with intercalated red shale layers. 
Toward the east the fossiliferous shales merge into flags, and then "n 
hard, coarse sandstone with flaggy layers along the eastern front of the 
Catskill Mountains. 
Since the rocks of the Catskill Mountains comprise the Chemung 
and Portage horizons, Mr. Darton proposes to discard the usé of 
Catskill to designate a formation, and to use the term Catskill group s 
include the Chemung and Portage formations. (Am. Journ. Science, 
March, 1893.) 
ee Pa) TENE SE el OAN 
Tertiary Insects from Colorado and Utah.—Bulletin No. 93 
of the Geological Survey comprises descriptions of eight spe o i 
Oli insects from Florissant and other points in Colorado mé 
Utah, by Samuel H. Scudder. sa 
Of this group of interesting fossils six are referred to new ge" a 
In a short introduction the author gives the special claim which each — 
