48 FRANK COLLINS BAKER 



STATION NO. 7 



Locality: Whiteside County, SE. \ of SE. \, Sec. 15, T. 20 N., 

 R. 3 E., stream-cut bank about 50 feet northwest of small bridge. 



Material: Where the fossils were collected the following section 

 was exposed: 



Feet 



5. Soil dark i-i^ 



4. Loesslike clay, dirty buff to buff, leached 1-2I 



3. Weathered zone, brownish, separates upper from lower material \ 



2. Loesslike clay, yellow with rusty spots, no structure 5 



I. Fossiliferous clay, blue silts, dense, sticky, calcareous i^ 



Stratigraphic horizon of No. i: Probably Wisconsin in age; per- 

 haps deposited in backwater of tributaries to the Mississippi 

 River during deposition of the Wisconsin Valley train in the 

 Mississippi Valley. 



MOLLUSCAN LIPE 



Six species of fresh mollusks (one a bivalve) and one species of 

 land mollusks were found in the fossiliferous bed, as noted: 



Fresh Water Land 



Pisidium costatum, rare. Succinea vermeta, common, 



Valvata sincera, abundant. 

 Planorbis altissimus, rare. 

 Galba palustris, rare, immature. 

 Galba dalli, common. 



The Succinea was doubtless washed into the stream from the 

 land. The near relative of vermeta, Succinea avara, is frequently 

 found on vegetation bordering streams or lakes. 



In the section it would be interesting to know just what the 

 weathered zone, stratum No. 3, indicates. It possibly indicates 

 Recent wash from the bordering hill slopes since man has disturbed 

 the soil conditions by removing the forests. 



STATION NO. 8 



Locality: Carroll County, NE. J of NE. I, Sec. 8, T. 23 N., 

 R. 5 E., south bluff of creek valley southeast of schoolhouse. 

 The bluff is 30 feet high and occurs in the end of a terrace spur at 

 the mouth of a tributary valley. 



