Tremadocianadj.
/trɛməˈdɒkɪən/ Geology.
Of, pertaining to, or designating a stratigraphic series typified by the Tremadoc beds, originally placed in the Upper Cambrian but now sometimes regarded as Lower Ordovician. Also absol.
ΘΚΠ
the world > the earth > structure of the earth > age or period > stratigraphic units > [adjective] > primary or Palaeozoic > Ordovician > specific
Caradoc1835
Tremadoc1847
Arenig1854
Skiddaw1897
Cincinnatian1899
Skiddavian1905
Caradocian1910
Tremadocian1910
1910 W. G. Fearnsides in Monckton & Herries Geol. in Field xxxii. 795 Across the denuded edges of Tremadocian and Olenidian rocks rest the basal members of the great Arenig series.
1927 Q. Jrnl. Geol. Soc. 88 145 The order of that succession is applicable in all its detail to the type-area of the Tremadocian in the western parts of Wales.
1950 David & Browne Geol. Commonwealth of Austral. I. iii. 135 By Tremadocian time graptolites had begun to make their appearance in Victoria.
1974 Nature 18 Oct. 575/1 None of the formal papers included any discussion of the boundaries of the Ordovician, most speakers making it clear whether they regarded the Tremadocian as Cambrian (as in English usage) or Ordovician.
This entry has not yet been fully updated (first published 1986; most recently modified version published online March 2019).
<
adj.1910