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DeepEarlyNeolithicBronze AgeIron Age and ClassicalMedievalEarlyModern

Ishango Bone

Precision Artifact

Description

Ishango Bone is a precision artifact in DR Congo, Africa. It is held at Royal Belgian Institute of Natural Sciences, Brussels. Royal Belgian Institute of Natural Sciences gives its chronology as “c. 20,000 years ago.” Royal Belgian Institute of Natural Sciences also records: “Tally or calculation device.”

A notched bone tool whose marks may record counting or a lunar calendar.

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Deep Prehistory — Ishango Bone in context.

Deep Prehistory, 2,000,000 BCE to 10,000 BCEDates supported by mainstream archaeology. Natural formations remain undated.Timeline22Schoningen Spears1,500,000 BCE1,000,000 BCE500,000 BCE100,000 BCE50,000 BCE20,000 BCE
Held atRoyal Belgian Institute of Natural Sciences, BrusselsConfidence: measured
MaterialBoneMohs 2-3 (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

20000 BCE - 18000 BCE

c. 20,000 years ago

Royal Belgian Institute of Natural Sciences
No claims found.
Purpose

Tally or calculation device

Royal Belgian Institute of Natural Sciences
No claims found.
MethodNo claims found.No claims found.
Sources: Royal Belgian Institute of Natural Sciences

Calculating elapsed time...

Approximate - counted from January 1, 19,000 BCE (UTC). Based on the midpoint of 20,000 BCE - 18,000 BCE; the underlying date is uncertain.

Separate totals since January 1, 19,000 BCE (UTC)
UnitCompleted total
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Each row is an independent total of the same span, not a breakdown to add together.

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