286 
IOWA ACADEMY OF SCIENCE 
is near the end of the hank it is possible that there has been 
a shifting of a part of the materials at this point since the main 
deposit was formed. However, at least fragments of several of 
the species given in the table are scattered throughout this strati- 
fied member of the series. 
It will be noticed that Lymnaea triincatula and Yalvata pisci- 
nalis are aquatic, while the remaining species are • terrestrial, 
though Yeftiga pygmaea and the larger species of Siiccinea are 
found usually in very wet places. This deposit was evidently 
formed in water, hut adjacent to bodies of land on which the 
rather numerous land shells developed. . 
THE EOESS SECTION. 
The prevailing loess is yellow, and in its physical characters 
closely resembles the heavier yellow loess which is common in 
Iowa. It is sometimes streaked with bluish gray, especially in 
its lower part, and usually shows the horizontal cleavage and 
the disposition to break into vertical columns which mark our 
own loess. It is also more or less fossiliferous, and contains a few 
calcareous nodules. In the Peczel sections this loess is not ex- 
posed to a greater depth than fifteen feet, but it probably is 
somewhat thicker. The sections a in figures 1 and 2 show yel- 
low loess only, and this rests directly upon the stratified layer 
below. Fossils seem to be scattered throughout the yellow loess, 
but by no means uniformly. The species from two of the sec- 
tions of yellow loess are checked in columns 3 and 4 of the 
table of mollusks. All are terrestrial. 
A lower gray loess, very similar to that which is found at 
many points in Iowa and other parts of the Mississippi valley, 
is also found in the Peczel exposures, and must be quite widely 
distributed as specimens of it in the museum of the Geological 
Institute at Budapest show. At Peczel the best exposure is that 
which lies immediately south of that figured in Plate XXXI, fig- 
ure 1. It is on the opposite side of a narrow ridge from the 
latter, and faces south. In this exposure the upper yellow loess 
is exposed to a depth of seven to eight feet, and below it four 
to five feet of gray loess appear. This closely resembles the 
gray (or bluish gray) loess of Iowa in color and texture, in its 
oxidized root lines, and in its wholly terrestrial fossils. The 
latter are checked in the fifth column of the table of mollusks. 
