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Alexandrian Series

Kankakee Formation- light colored dolomite; contains much interbedded chert. Approx thickness 155 ft. Englewood Dolomite- gray, sandy, silty, argillaceous dolomite. Approx thickness 55 ft
State Iowa
Name Alexandrian Series
Geologic age Phanerozoic | Paleozoic | Silurian
Comments Approx total thickness 210 ft
Primary rock type dolostone (dolomite)
Secondary rock type chert
Other rock types
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Chemical > Chert (Bed)
Map references
Hershey H. G. 1969, Geologic Map of Iowa: Iowa Geological Survey, scale 1:500K
Unit references
Hershey H. G. 1969, Geologic Map of Iowa: Iowa Geological Survey, scale 1:500K
Counties Black Hawk - Bremer - Buchanan - Cedar - Clayton - Clinton - Delaware - Dubuque - Fayette - Jackson - Jones - Linn