Valentianadj.

1879 C. Lapworth in Ann. & Mag. Nat. Hist. 3 (table facing p. 455) Silurian system... Lower division (Valentian).

1880 C. Lapworth in Ann. & Mag. Nat. Hist. 3 47 In the south of Scotland (Valentia)..three subformations are recognizable... Until geologists are willing to include the Tarannon in the Llandovery it will..be best to speak of this great Scottish formation and its equivalents as the Valentian formation, its three divisions, Lower, Middle, and Upper, representing respectively the Lower Llandovery, Upper Llandovery, and Tarannon of Wales and Siluria.

1921 Q. Jrnl. Geol. Soc. 77 158 Some assistance in this comparison is afforded by the Valentian rocks of the Lake District.

1946 L. D. Stamp Britain's Struct. & Scenery xii. 109 Though various divisions of the Silurian have been proposed the old three-fold one into: (3) Ludlow Series or Ludlovian; (2) Wenlock Series or Wenlockian; (1) Llandovery Series or Valentian; has stood the test of time and is most convenient.

1974 Encycl. Brit. Macropædia XVI. 774/2 The oldest interval, the Llandoverian (or Valentian), saw the beginning of a sharp distinction between basin graptolitic shale facies and calcareous..shelf facies.