Thunderbird Archeological District
Encyclopedia
Thunderbird Archeological District
"The district consists of three sites--Thunderbird Site, the Fifty Site, and the Fifty Bog--which provide a stratified cultural sequence spanning Paleo-Indian cultures through the end of Early Archaic times with scattered evidence of later occupation."

It was declared a National Historic Landmark
National Historic Landmark
A National Historic Landmark is a building, site, structure, object, or district, that is officially recognized by the United States government for its historical significance...

in 1977.
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