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CodexMira
DeepEarlyNeolithicBronze AgeIron Age and ClassicalMedievalEarlyModern

Effigy Mounds

Geoglyph and Earthwork

Description

Effigy Mounds is a geoglyph and earthwork in United States, North America. US National Park Service dates it to c. 700-1100 CE. Its listed material is Earth and stone. US National Park Service also records: “Ceremonial mounds.”

Earthen mounds shaped as bears and birds above the Mississippi.

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Medieval — Effigy Mounds in context.

Medieval, 500 CE to 1,500 CEDates supported by mainstream archaeology. Natural formations remain undated.Timeline612532621366552351055613132672111415600 CE800 CE1,000 CE1,200 CE1,400 CE
MaterialEarth and stoneMohs 1-3 (mineral hardness scale)

Claims

Compare the published evidence and its interpretations. “Consensus” records the mainstream account; “Alternative” identifies a competing interpretation, not an equally established conclusion. Estimates and unresolved questions remain qualified in the claim text.

FieldConsensusAlternative
Date

700 CE - 1100 CE

c. 700-1100 CE

US National Park Service
No claims found.
Purpose

Ceremonial mounds

US National Park Service
No claims found.
MethodNo claims found.No claims found.
Sources: US National Park Service

Calculating elapsed time...

Approximate - counted from January 1, 900 CE (UTC). Based on the midpoint of 700 CE - 1,100 CE; the underlying date is uncertain.

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