326 The American Geologist. November, i89j< 
efficiency to the end of his life, as attested by this annual report. The 
second volume, which is yet to be issued, will comprise Hall's discussion 
of Streptelasma and allied genera of rugose corals, and his memoir on 
the Paleozoic hexactinellid sponges constituting the family Dictyospon- 
gidae. More than 120 species of this family, in 29 genera, are known and 
will be described, with illustrations, in this memoir, more than 70 of 
these species being recognized in the Chemung fauna. w. u. 
Intej-glacial Deposits in Iowa : a Symposium presented at the louui 
Academy of Sciences, Des Moines, Dec. 28, i8gy. Papers by Samuel 
Calvin, Frank Leverett, H. Foster Bain, and J. A. Udden; 41 
pages, with plates iv-vii, and two maps, reprinted from the Proceedings 
of the Academy, vol. V, i8g8. 
Abstracts of the papers comprised in this brochure were given in 
the American Geologist for April, 1898 (Vol. XXI, pp. 251-264). 
Nearly all of our American glacial and interglacial formations, so 
far as they have been already somewhat fully discriminated, have 
a good development within the state of Iowa; and several members 
of that series, as the Aftonian, Buchanan, and lowan, are there most 
typically developed, and thence derive their names. The rapidity with 
which these formations have been discriminated and first published 
under these names during the last four years, and the important 
changes of their order required by the study of sections in Iowa, 
make it very desirable to consider them in their sequence and rela- 
tionships, as in these papers. According to the nomenclature pro- 
posed in successive parts by Chamberlin, G. M. Dawson, Calvin and 
Leverett, the series is as follows, in the order of age from the earliest 
to the latest: 1. Albertan till; 2. Aftonian interglacial deposits, prob- 
ably equivalent with the Saskatchewan beds; 3. Kansan till; 4. Bu- 
chanan interglacial beds, with the Yarmouth zone of weathering and 
erosion; 5. Illinoian till; 6. Sangamon interglacial deposits and 
weathered zone; 7. lowan till; 8. Peorian soil and associated modified 
drift, including the chief mass of the loess, especially prolonged in 
its deposition adjacent to the Altamont moraine in northwestern Iowa; 
9. Early Wisconsin moraines and till; 10. Later Wisconsin moraines 
and till. Through this classification, with names of geographic origin, 
the Mississippi and Saskatchewan basins become the standard of com- 
parison for future studies and correlation of the North American 
stages of the Glacial period, like the New York nomenclature for the 
periods of the Paleozoic era. w. u. 
Report on a Traverse of the Northern Part of the Labrador Peninsu- 
la from Richmond Gulf to Ungava Bay. By A. P. Low. Geol. Survey 
of Canada, Annual Report, vol. IX, Part L, 43 pages, with four plates; 
Ottawa, 1898. 
The journey of exploration here reported was made during the 
summer of 1896. It included about 500 miles of travel by canoes and 
over portages, the route being up the Wiachouan and Clearwater 
rivers to Clearwater lake; thence north to Seal lake, tributary to 
Hudson bay by the Nastapoka river: and thence by the Stillwater 
