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Progress in Earth and Planetary Science

Table 3 Duration of Toarcian biochronozones

From: Early Jurassic extrinsic solar system dynamics versus intrinsic Earth processes: Toarcian sedimentation and benthic life in deep-sea contourite drift facies, Cardigan Bay Basin, UK

Aalensis

 > 0.1 Myr

Pseudoradiosa

1.4 ± 0.02 Myr

Dispansum

0.3 ± 0.07 Myr

Thouarsense

0.8 ± 0.1 Myr

Variabilis

2.4 ± 0.1 Myr

Bifrons

2.1 ± 0.5 Myr

Serpentinum

1.4 ± 0.4 Myr

Tenuicostatum

0.9 ± 0.1 Myr

TOARCIAN

 > 9.4 Myr

  1. Note that most of the Aalensis Zone is missing in the Mochras section. All durations are minima and the uncertainties relate only to precision of the placement of the zonal boundaries in the core based on ammonite distributions recorded in Additional files 3–5
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