Английская Википедия:Glenwood Formation
Материал из Онлайн справочника
The Glenwood Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
See also
References
Шаблон:Chronostratigraphy of Illinois Шаблон:Chronostratigraphy of Minnesota
Шаблон:Illinois-geologic-formation-stub