H. B. Willman and John C. Frye
The Batavia Member of the Henry Formation is named for Batavia, Kane County, which is near the west side of an extensive outwash plain along the front of the West Chicago Moraine.
The type exposure is in gravel pits 8 miles north of Batavia, SW Sec. 1, T. 40 N., R. 8 E., where 20 feet of the Batavia Member, consisting of well sorted, regularly bedded gravel, is overlain by 1 to 2 feet of leached brown silt (Richland Loess and Modern Soil).
The Batavia Member is an upland unit deposited largely along the fronts of moraines. In some areas the outer margin of the outwash plain converges into valleys, and the deposits grade into the valley trains of the Mackinaw Member. In general the deposits in the outwash plains vary in degrees of coarseness more rapidly, both laterally and vertically, than the valley train deposits, and their bedding is less uniform. Some outwash plains deposited near the ice front are pitted, have complex structures, and grade into ice-contact deposits of the Wasco Member. A few deposits of outlet rivers from glacial lakes are similar in character and are included in the Batavia Member.
Age and correlation
The Batavia Member is Wisconsinan in age.
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