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The common reference for delta 13C Marine Carbonate Standard was obtained from a Cretaceous marine fossil, Belemnitella americana, from the PeeDee Formation in South Carolina. This material has a higher 13C/12C ratio than nearly all other natural carbon-based substances. For convenience it is assigned a delta 13C value of zero, giving almost all other naturally-occurring samples a positive delta value.

The original sample was used up long ago, but a Vienna-based laboratory calibrated a new reference sample to the original fossil, giving rise to the widespread use of the term Vienna- PeeDee Belemnite standard, abbreviated to V-PDB.

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βˆ™ 14y ago
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Phil Fuhrman

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βˆ™ 3y ago
There is a typo in the last sentence of the first paragraph.Β  It should read:Β For convenience it is assigned a delta 13C value of zero, giving almost all other naturally-occurring samples a NEGATIVE delta value.

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Q: What is Vienna pee Dee belemnite standard vpdb?
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Why Vienna pee dee belemnite standard vpdb called So?

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