30 IOWA ACADEMY OF SCIENCES. 



it is about 50 cents. And improved methods have just been announced by which 

 it may be extracted at a cost of less than 20 cents per pound. 



A few months ago a plant was established at Hampton, Iowa, which is working 

 a clay yielding three ounces more oi aluminum to the bushel than in any other 

 known locality m the west, and, perhaps, in the United States. The suggestion 

 is important. Iowa has within her borders inexhaustible supplies of good clays 

 admirably adapted for this purpose. But they require careful investigation that 

 they may not be worked indiscrimmately and thereby lead to complete failure in 

 many cases. When the industry shall have become thoroughly established the 

 gold fields of California, of Australia, of indeed the whole world will sink into 

 insignificance as compared with the wealth coming from this source. 



ON A QUATERNARY SECTION EIGHT MILES SOUTH-EAST OF DES 

 MUlNES, IOWA. 



BY CHAKLES E. KEYES AKD U. ELLSWOllTH CALL. 



The section is located on the line of the Wabash railway about two miles below 

 the little station of Hastie. It forms a continuous exposure of nearly three-fourths 

 of a mile in length; and in some places has almost a vertical face of from 125 to 150 

 feet. It is capped by twenty feet of loess, carrying characteristic fossils such as 

 Succinea amraSay; SiiccineaohliqiiaSsiy; Heliciua occulta Say; Pupa muscomm 

 Linne; ValloniapithheUa MuUer; Zonites arboreus, Say; Patula sfrigosa, .Gould; 

 and a large Helix, probably Mesodon thi/roichs, Say. Below the loess to the track 

 level the section is made up of blue clays and straticulate sands and gravels with 

 occasional large boulders, in the gravel several large fragments of carboniferous 

 limestone with fossils were found. The lower sands rest directly upon the coal 

 measure shales probably since these are well shown in the river bed 10 teet below 

 the track. 



The section is of special inteiest, inasmuch as it is near the terminal moraine of 

 the Des Moines lobe of the great glacier usually referred to the second epoch of the 

 North American Ice Age. 



NOTE ON THE DIFFERENCES BETWEEN ACERVULARIA PROFDNDA 



HALL, AND ACERVULARIA DAYIDSONI EDWARDS 



AND HAINE. 



BY S. CALVIN. 



The original description of Acervidarki profunda Hall, is found in Hall's 

 Report on the Geological Survey of Iowa, published in l::^58. The specimens on 

 which the species was founded came from near Independence, in Buchanan county. 



