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Hettangium
Hettangium (scilicet "aevum")[1][2] est prima aevi Iurassici inferioris pars, quae 199,6 ± 0,6 millionibus annorum abhinc coepit, cum aevum Triassicum perfecit, et 196,5 ± 1 millionibus annorum abhinc perfecit, cum epocha Sinemurensis coepit.
Nomen capit ab urbe Francogallica Hettange-Grande.
- ↑ Stratigraphische Tabelle von Österreich 2004
- ↑ Christof Kuhn, "Etymology of geological time units"
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