STRIATIONS--Showing direction of glacier movement
Lava Creek B (Pearlette O) volcanic ash bed
LOCATION OF SIGNIFICANT STRATIGRAPHIC SECTION--County Line section, Harrison County, Iowa
LOCATION OF SIGNIFICANT STRATIGRAPHIC SECTION--Hummel Park section, Douglas County, Nebraska
LOCATION OF SIGNIFICANT STRATIGRAPHIC SECTION--Yarmouth subsurface section, Des Moines County, Iowa
LOCATION OF SIGNIFICANT STRATIGRAPHIC SECTION--Mt. Ayr composite section, Ringgold County, Iowa
LOCATION OF SIGNIFICANT STRATIGRAPHIC SECTION--Afton section, Union County, Iowa
LOCATION OF SIGNIFICANT STRATIGRAPHIC SECTION--City Wide Rock Quarry section, Sarpy County, Nebraska
LOCATION OF SIGNIFICANT STRATIGRAPHIC SECTION--City Wide Rock and Excavation Company Quarry section, Sarpy County, Nebraska