Downtonianadj.n.

Brit.

/daʊnˈtəʊnɪən/, U.S.

/ˌdaʊnˈtoʊniən/

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

Etymology: < Downton, the name of a civil parish in the extreme north of Herefordshire, where this stratigraphic stage is found + -ian suffix.

Geology. Now historical.

A. adj.

Designating a stratigraphic stage or series of rocks corresponding to the lowermost Devonian and (originally) the uppermost Silurian; of or relating this stage or series.

ΘΚΠ

the world > the earth > structure of the earth > age or period > stratigraphic units > [adjective] > primary or Palaeozoic > Silurian > specific

Taconic1842

Ludlovian1855

wenlockian1855

Salopian1869

Downtonian1879

Valentian1879

Gotlandian1909

Salinan1909

1879 C. Lapworth in Ann. & Mag. Nat. Hist. 3 (table facing p. 455) Silurian System: Upper Division (Downtonian).

1910 P. Lake & R. H. Rastall Text-bk. Geol. xx. 334 The Downtonian series varies little. Wherever it occurs, whether on the Welsh borders, in the Lake District or in the south of Scotland, it is essentially an arenaceous deposit and was formed in shallow water.

1938 A. K. Wells Outl. Hist. Geol. vii. 67 The thickness of the Downtonian Stage diminishes.

1967 D. H. Rayner Stratigr. Brit. Isles v. 140 Molluscs..are often abundant in the lower Downtonian beds.

2010 Internat. Jrnl. Coal Geol. 83 156/1 Many of the Downtonian samples, from which Lang (1937) described both Cooksonia and Nematothallus, are dominated by organic fragments which are thalloid in shape.

B. n.

Chiefly with the. The Downtonian stage; the series of rocks dating from this time.

ΘΚΠ

the world > the earth > structure of the earth > age or period > stratigraphic units > [noun] > primary or Palaeozoic > Silurian > specific

grauwacke1794

greywacke1805

Wenlock formation1834

Trenton1854

obolite grit1859

Salina1863

Downtonian1900

1900 Jrnl. Geol. (Chicago) 8 79 The Downtonian which hitherto has not been recognized as a part of the Silurian is probably the equivalent of the Water- lime formation of our own country.

1955 G. G. Woodford tr. M. Gignoux Stratigr. Geol. iv. 110 Similar sediments are seen on the edges of the Baltic Shield... This Baltic Downtonian is attached to the Silurian by Scandinavian geologists.

1971 B. W. Sparks Rocks & Relief viii. 295 In this account the Downtonian will be included in the Devonian.

2015 Rev. Palaeobot. & Palynol. 221 145/1 The Downtonian is now regarded as approximately equivalent to the Přídolí Series for which the stratotype is defined in marine sequences of the Czech Republic.

This entry has been updated (OED Third Edition, December 2018; most recently modified version published online March 2022).

单词	downtonian
释义	Downtonianadj.n. Brit. /daʊnˈtəʊnɪən/, U.S. /ˌdaʊnˈtoʊniən/ Origin: From a proper name, combined with an English element. Etymons: proper name Downton , -ian suffix. Etymology: < Downton, the name of a civil parish in the extreme north of Herefordshire, where this stratigraphic stage is found + -ian suffix. Geology. Now historical. A. adj. Designating a stratigraphic stage or series of rocks corresponding to the lowermost Devonian and (originally) the uppermost Silurian; of or relating this stage or series. ΘΚΠ the world > the earth > structure of the earth > age or period > stratigraphic units > [adjective] > primary or Palaeozoic > Silurian > specific Taconic1842 Ludlovian1855 wenlockian1855 Salopian1869 Downtonian1879 Valentian1879 Gotlandian1909 Salinan1909 1879 C. Lapworth in Ann. & Mag. Nat. Hist. 3 (table facing p. 455) Silurian System: Upper Division (Downtonian). 1910 P. Lake & R. H. Rastall Text-bk. Geol. xx. 334 The Downtonian series varies little. Wherever it occurs, whether on the Welsh borders, in the Lake District or in the south of Scotland, it is essentially an arenaceous deposit and was formed in shallow water. 1938 A. K. Wells Outl. Hist. Geol. vii. 67 The thickness of the Downtonian Stage diminishes. 1967 D. H. Rayner Stratigr. Brit. Isles v. 140 Molluscs..are often abundant in the lower Downtonian beds. 2010 Internat. Jrnl. Coal Geol. 83 156/1 Many of the Downtonian samples, from which Lang (1937) described both Cooksonia and Nematothallus, are dominated by organic fragments which are thalloid in shape. B. n. Chiefly with the. The Downtonian stage; the series of rocks dating from this time. ΘΚΠ the world > the earth > structure of the earth > age or period > stratigraphic units > [noun] > primary or Palaeozoic > Silurian > specific grauwacke1794 greywacke1805 Wenlock formation1834 Trenton1854 obolite grit1859 Salina1863 Downtonian1900 1900 Jrnl. Geol. (Chicago) 8 79 The Downtonian which hitherto has not been recognized as a part of the Silurian is probably the equivalent of the Water- lime formation of our own country. 1955 G. G. Woodford tr. M. Gignoux Stratigr. Geol. iv. 110 Similar sediments are seen on the edges of the Baltic Shield... This Baltic Downtonian is attached to the Silurian by Scandinavian geologists. 1971 B. W. Sparks Rocks & Relief viii. 295 In this account the Downtonian will be included in the Devonian. 2015 Rev. Palaeobot. & Palynol. 221 145/1 The Downtonian is now regarded as approximately equivalent to the Přídolí Series for which the stratotype is defined in marine sequences of the Czech Republic. This entry has been updated (OED Third Edition, December 2018; most recently modified version published online March 2022). < adj.n.1879
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