.i8o The American Geologist. ^^^'^i^- ^''os. 
REVIEW OF RECENT GEOLOGICAL 
LITERATURE. 
Alphabetical cross-reference cataiogne of all the publications of Edward 
Drinker Cope, from 1859 till his death in 1897. Persifor Frazer. 
(Mem. Revista, Soc. Cien., Antonio Alzate, 1899-1900. Mexico. 
All paleontologists and other naturalists who study the work of Cope 
will be pleased to have this thorough catalogue. B3' it any paper of 
Cope may be found without delay. Dr. Frazer has rendered a great 
service to the memory of Cope as well as to future generations that will 
desire to know of his writings. n. h. w. 
Recent Geologic work in Franklin and St. Lazurence counties [New 
York]. H. P. CusHiNG.. (20th report of the State Geologist, 1900, 
reprinted from the 54th annual report of the New York state mu- 
seum, pp. r23-r82, Albany, 1902.) 
Prof. Cushing is carrying on a series of careful diagnostic distinc- 
tions in the Adirondacks, based largely on field observations in the 
areas of gneiss, granite and anorthosyte. He is approaching some con- 
clusions on topics which are of fundamental importance in Archean 
geology. His latest results are summarized as follows, by himself: 
"The above recorded observations seem to the writer to prove in 
some cases, and to strongly indicate in others : 
1. That the Adirondack anorthosyte is cut intrusively by an augite 
syenite which is therefore younger. 
2. That while the larger part of the augite-syenite of the Adiron- 
dacks is in such situation in respect to the anorthosyte as to render 
impossible any determination of relative age, its general character is 
so uniform throughout that it is exceedingly probable that it is all of 
the same approximate age, and consists of intrusions from this same 
source. 
3. That at their borders these syenites pass over into granite, 
part of which at least cut the syenite eruptively and are therefore 
younger. 
4. That the syenite grades into granite on the one hand and into 
gabbro-dioryte on the other, and apparently into anorthosyte as well. 
5. That the three together, anorthosyte, syenite, and granite, form 
a great eruptive complex in the heart of the Adirondack region, and 
that all are younger than the (in part at least) sedimentary Grenville 
rocks. 
The writer was at first disposed to take a different view from that 
given above, thinking that the probable explanation of the phenomena 
was the presence of augite-syenite of two different ages in the region, 
the one younger and the other older than the anorthosyte, the last to 
be classed in the general gneiss series of the Adirondacks. While that 
may yet prove the true explanation, the probabilities seem to favor the 
one outlined above." 
Mr. Cushing gives very pertinent remarks on the classification of the 
Adirondack pre-Cambrian rocks, and on the relationship of the syenite 
and granite to the anorthosyte. N. H. w. 
