Purely Paleozoic, Mixed and Uncertain Periods (based on Wikipedia, List of Fossil Sites)

Devonian – Carboniferous

North America
Bakken Formation	USA: Montana, North Dakota and Canada: Saskatchewan	Upper Devonian – Lower Carboniferous (Early Mississippian)

Silurian - Devonian

Oceania
Heathcote siltstone	Australia: Victoria	Lower Silurian- Upper Devonian
North America
Delorme Formation	Canada: Yukon

Ordovician - Silurian

Europe
Dob's Linn	Scotland	Ordovician-Silurian boundary

Cambrian – Permian

Africa
Alnif	Morocco	Cambrian – Late Permian