Portlandianadj.n.

Brit.

/pɔːtˈlandɪən/, U.S.

/pɔrtˈlændiən/

Forms: also with lower-case initial.

Origin: From a proper name, combined with an English element. Etymons: proper name Portland , -ian suffix.

Etymology: < the name of Portland (see Portland n.) + -ian suffix, after Portland oolite n. at Portland n. 1b.

Geology.

A. adj.

Of, relating to, or designating the uppermost division of the Jurassic of Europe, in which Portland oolite occurs, sometimes regarded as a stage lying above the Kimmeridgian. Cf. Tithonian adj. and n.

ΘΚΠ

the world > the earth > structure of the earth > age or period > stratigraphic units > [adjective] > secondary or Mesozoic > Jurassic > specific

Purbeck stone1410

Oxfordian1845

Portlandian1845

Callovian1851

Kimmeridgian1851

Bathonian1858

Sinemurian1863

Tithonian1869

Toarcian1885

Kellovian1888

Aalenian1896

Pliensbachian1952

1845 N. Brit. Rev. Aug. 496 The organic contents of the Lias, those of the Oolitic group properly so called, those of the Oxfordian group, and those of the Portlandian group, as they occur in Switzerland, are as different from each other as the fossils of the Lias from those of the Keuper.

1885 A. Geikie Text-bk. Geol. (ed. 2) 799 Among Portlandian fossils a single species of coral (Isastræa oblonga) occurs.

1946 L. D. Stamp Britain's Struct. & Scenery xii. 135 It is possible that northern England was raised above sea level for a very short period in Portlandian times.

1999 Hobart Mercury (Austral.) (Nexis) 21 July The argument centres on the precise type of limestone—kimmeridgian or portlandian—underlying a particular hillside or vineyard.

B. n.

The Portlandian stage or series of rocks. Chiefly with the.

ΚΠ

1859 Geologist 2 7 I saw..that the strata in the Jura Portlandian were not equivalent to the Portland-stone of England, but a little younger.

1886 Amer. Naturalist 20 60 After the Sequanian they suddenly diminish, and only one species occurs in the Portlandian.

1931 J. W. Gregory & B. H. Barrett Gen. Stratigr. x. 155 In places the Kimeridgian becomes sandy towards the top before passing into the Portlandian.

1995 Internat. Jrnl. Plant Sci. 156 910 The fossil record..reveals wide distribution..from at least the Early Cretaceous (Berriasian) and possibly the Late Jurassic (Portlandian) to the Plio-Pleistocene.

This entry has been updated (OED Third Edition, December 2006; most recently modified version published online March 2022).

单词	portlandian
释义	Portlandianadj.n. Brit. /pɔːtˈlandɪən/, U.S. /pɔrtˈlændiən/ Forms: also with lower-case initial. Origin: From a proper name, combined with an English element. Etymons: proper name Portland , -ian suffix. Etymology: < the name of Portland (see Portland n.) + -ian suffix, after Portland oolite n. at Portland n. 1b. Geology. A. adj. Of, relating to, or designating the uppermost division of the Jurassic of Europe, in which Portland oolite occurs, sometimes regarded as a stage lying above the Kimmeridgian. Cf. Tithonian adj. and n. ΘΚΠ the world > the earth > structure of the earth > age or period > stratigraphic units > [adjective] > secondary or Mesozoic > Jurassic > specific Purbeck stone1410 Oxfordian1845 Portlandian1845 Callovian1851 Kimmeridgian1851 Bathonian1858 Sinemurian1863 Tithonian1869 Toarcian1885 Kellovian1888 Aalenian1896 Pliensbachian1952 1845 N. Brit. Rev. Aug. 496 The organic contents of the Lias, those of the Oolitic group properly so called, those of the Oxfordian group, and those of the Portlandian group, as they occur in Switzerland, are as different from each other as the fossils of the Lias from those of the Keuper. 1885 A. Geikie Text-bk. Geol. (ed. 2) 799 Among Portlandian fossils a single species of coral (Isastræa oblonga) occurs. 1946 L. D. Stamp Britain's Struct. & Scenery xii. 135 It is possible that northern England was raised above sea level for a very short period in Portlandian times. 1999 Hobart Mercury (Austral.) (Nexis) 21 July The argument centres on the precise type of limestone—kimmeridgian or portlandian—underlying a particular hillside or vineyard. B. n. The Portlandian stage or series of rocks. Chiefly with the. ΚΠ 1859 Geologist 2 7 I saw..that the strata in the Jura Portlandian were not equivalent to the Portland-stone of England, but a little younger. 1886 Amer. Naturalist 20 60 After the Sequanian they suddenly diminish, and only one species occurs in the Portlandian. 1931 J. W. Gregory & B. H. Barrett Gen. Stratigr. x. 155 In places the Kimeridgian becomes sandy towards the top before passing into the Portlandian. 1995 Internat. Jrnl. Plant Sci. 156 910 The fossil record..reveals wide distribution..from at least the Early Cretaceous (Berriasian) and possibly the Late Jurassic (Portlandian) to the Plio-Pleistocene. This entry has been updated (OED Third Edition, December 2006; most recently modified version published online March 2022). < adj.n.1845
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