Ypresianadj.
/iːˈprɛsɪən/ Geology.
Of, pertaining to, or designating the lowest stage of the Eocene in western Europe, lying above the Landenian. Also absol.
ΚΠ
1852 Q. Jrnl. Geol. Soc. 8 323 The group of tertiary strata which we meet with next in the descending order in Belgium (comprising the ‘Systèmes Laekenien, Bruxellien et Ypresien’ of M. Dumont) corresponds most nearly.. in age with the Barton, Bagshot, and Bracklesham beds.]
1880 J. D. Dana Man. Geol. (ed. 3) iii. 512 London Clay; Lower Ypresian of Belgium.
1969 G. M. Bennison & A. E. Wright Geol. Hist. Brit. Isles xv. 339 The Ypresian cycle commenced with the basement bed of the London clay.
1977 A. Hallam Planet Earth 227 The most commonly accepted stages [of the Eocene] include (from oldest to youngest) the Ypresian, Lutetian and Bartonian.
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).
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adj.1880