The Claim

Zinc isotope ratios in fossil tooth enamel from Tam Hay Marklot cave, Laos, are preserved with minimal diagenetic alteration, as demonstrated by Zn concentration profiles that match those of modern teeth and the lack of correlation between δ66Zn values and trace elements indicative of postmortem contamination (e.g., Fe, Mn, Al, REEs), despite poor collagen preservation in the same samples.

Source: Zinc isotopes in Late Pleistocene fossil teeth from a Southeast Asian cave setting preserve paleodietary information

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
15score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Description
1 study reviewed
In plain English

The zinc isotope signatures in ancient human teeth from Laos have remained unchanged since burial, because their chemical patterns match those of modern teeth and show no link to elements that typically enter bones and teeth after death, even though other organic material in the samples has degraded.

See the scientific wording

Zinc isotope ratios in fossil tooth enamel from Tam Hay Marklot cave, Laos, are preserved with minimal diagenetic alteration, as evidenced by Zn concentration profiles matching those of modern teeth and the absence of correlation between δ66Zn values and trace elements associated with postmortem contamination (e.g., Fe, Mn, Al, REEs), despite poor collagen preservation in the same samples.

Why this might work

When animals eat, zinc from their food gets absorbed and locked into their developing teeth in a pattern that reflects what they ate. Once the tooth is fully formed, the zinc becomes part of a very stable mineral structure that doesn’t change even after thousands of years buried in the ground, so the original chemical signal stays intact.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Zinc isotopes in Late Pleistocene fossil teeth from a Southeast Asian cave setting preserve paleodietary information

    The zinc pattern in these ancient teeth looks just like in modern teeth and isn't mixed up with dirt minerals, meaning the original chemical signal from when the animals were alive is still intact after tens of thousands of years.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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