33^ Correspondence. 
The Geological Record for 1879. An account of works on geology, min- 
eralogy and pala;ontology published during the year; with supplements 
for 1874-1878. W. Whitaker and W. II. Dalton. 418 pp. 1S87 London. 
Annalen des k. k. naturhistorischen I lof museums redigirts, von Dr. 
Franz. Ritter von Hauer. Sieben Tafeln. Band 11. Nr. 4. 1887. Band 
III. Nr. 1.188S. Wien. 
Memorias de la Sociedad Cientifica "Antonio Alzate," Tomo I. Cuad- 
erno num. 8. Febrero de 1888. Mexico. 
Extrait de rannuairegeologique,Tome 111,1887. Compt-rendu de pub- 
lications relatives k la geologie de I'Asie et de I'Amerique par M. Emm. 
de Margerie 1887. Paris. 
Memorias de la sociedad cientifica "Antonio alzate." Tome i. Cuader- 
no num. 9. Marzo de 18S8. 
CORRESPONDENCE. 
JVote on ike Cascade Anthracite basin., Rocky Aloitntains. Referring to 
the analysis of anthracite from the Canadian Anthracite Go's mine pub- 
lished in your issue for March, and the remarks quoted from Mr. Pugh re- 
specting the coal basin in the Bow river valley, it may be of interest to 
your readers to know that the district in question is described in the an- 
nual reports of the geological survey of Canada for 1884, 1885, and 1886. 
The coal bearing rocks form an elongated basin or trough in the eastern- 
most great longitudinal valley of the Rocky mountains where crossed by 
the Canadian Pacific railway. This trough has been continuously traced 
by the writer (as shown on map accompanying the report for 1885) from 
the Kananaskis river northwestward to lat. 51° 43' or for about seventy 
miles. Its northern extension has not yet been fully ascertained as it was 
not followed in 1884 beyond the edges of the map sheet. The average 
width of the trough is about two miles, and disregarding minor irregular- 
ities, its structure is that of a synclinal completely overturned to the 
north-eastward so that the beds now dip almost uniformly to the south- 
westward. The south-western edge of the trough is generally and pos- 
sibly throughout its length bounded by an extensive fault, which, it has 
been ascertained by Mr. R. S. McConnell, has at one place (near Caumore) 
a downthrow to the north-eastward of 10,000 feet. The coal bearing rocks 
themselves are of lower Cretaceous age and referable to the Kootanie 
series, with a peculiar and characteristic flora which is described and il- 
lustrated by Sir. Wm. Dawson in volume iii of the transaction of the 
Royal Society of Canada. The ascertained thickness of the Cretaceous 
rocks here is abovit 5000 feet, but elsewhere in the mountains the lower 
part of the Kootanie series, beneath the principal coal-bearing horizon, is 
known to have a volume of about 7000 feet. The Cretaceous infold here 
