152 IOWA ACADEMY OF SCIENCE 



EXPLANATION OF PLATES. 



Plate V, Fig. 1. — A portion of the east side of Crowley's Ridge at 

 Helena, Arkansas. 



Fig. 2. — Cut on the south side of Porter street, west of 1st street, 

 Helena, 

 a — Red loess, 2 feet. 



b — White fossiliferous loess, 25 to 30 feet, 

 c — Dark colored band at base of loess, 

 d — Red mucky clay, 

 e — A gravelly stratum. 



Plate V A, Fig. 1. — Cut facing Poplar street, north of Elm street, 

 Helena, Arkansas. 



a — Red loess, variable in thickness. Fdfesiliferous. 

 b — Transition band between the two loesses, 

 c — White loess, very fossiliferous. 

 Fig. 2. — Cut southwest of Madison, Arkansas. 

 a — Red loess. 4-5 feet. 



b — White loess, 2-3 feet; with fragments of fossils. 

 c — A gravelly layer. 



Plate V B, Fig. 1. — A cut west of Poplar street, and facing St. Mary's 

 street, Helena, Arkansas, 

 a — White loess, 

 b — Heavier clay, 

 c — Shell band, 

 d — Cavity in which shell band may form. 



Fig. 2. — A shell band between two markers. Same section as in 

 fig. 1. 



