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Evolution of Life

How these connect

Molecular clock dating and what it relates to. Every line is an evidence-backed relation, and the arrangement is fixed — this address draws this picture, today and next year.

assesses — Molecular estimates place the divergences of the major animal lineages before the Cambrian base, so the clock and the fossil record give different answers to the same question.assesses — LUCA is not observed anywhere in the rock record; every date and every trait attributed to it comes from phylogenetic reconstruction across living genomes.depends_on — A molecular clock has no absolute scale of its own and must be calibrated against radiometrically dated fossil horizons, inheriting their uncertainties.The Cambrian explosionThe Cambrian explosionMolecular clock datingMolecular clock datingRadiometric datingRadiometric datingLUCA — the last universal common ancestorLUCA — the last universal…
4 drawn · 10 reachable and not drawn · positions derived from object ids, never from a simulation
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Every relation drawn, in words3
  1. Molecular clock dating · assesses · The Cambrian explosion

    Molecular estimates place the divergences of the major animal lineages before the Cambrian base, so the clock and the fossil record give different answers to the same question.

  2. Molecular clock dating · assesses · LUCA — the last universal common ancestor

    LUCA is not observed anywhere in the rock record; every date and every trait attributed to it comes from phylogenetic reconstruction across living genomes.

  3. Molecular clock dating · depends_on · Radiometric dating

    A molecular clock has no absolute scale of its own and must be calibrated against radiometrically dated fossil horizons, inheriting their uncertainties.