Tuedianadj.

/ˈtwiːdɪən/

Forms: Also Twedian.

Etymology: < medieval Latin Tueda the river Tweed + -ian suffix.

Geology.

An epithet applied by George Tate in 1856 to the lowest beds of the Carboniferous series, as developed in and near the valley of the Tweed.

ΚΠ

1856 R. Embleton in Hist. Berwickshire Naturalists' Club 3 No. 7. 219 These beds form the lowest portion of the Carboniferous formation, lying below the Productal and Encrinal Mountain Limestone of Northumberland, and might properly be designated as the Tuedian group... Specimens of these fossils were exhibited by Mr. Tate.

1859 Tate in Hist. Berwickshire Naturalists' Club IV. No. 3. 151 In 1856, I applied this name [Tuedian] to a series of beds, lying below the Mountain Limestone, which are largely developed on the Tweed.

1876 D. Page Adv. Text-bk. Geol. (ed. 6) xiv. 240 The term Calciferous sandstones..is sometimes employed, as well as the more strictly local one of Twedian beds.

1882 G. A. Lebour in Hist. Berwickshire Naturalists' Club 9 No. 3. 527 This great division..has been..split into two members, the Bernician above,..and the Tuedian below, the equivalent of the Calciferous Sandstone Series and part of the Upper Old Red Sandstone of Scotland.

This entry has not yet been fully updated (first published 1915; most recently modified version published online December 2020).

单词	tuedian
释义	Tuedianadj. /ˈtwiːdɪən/ Forms: Also Twedian. Etymology: < medieval Latin Tueda the river Tweed + -ian suffix. Geology. An epithet applied by George Tate in 1856 to the lowest beds of the Carboniferous series, as developed in and near the valley of the Tweed. ΚΠ 1856 R. Embleton in Hist. Berwickshire Naturalists' Club 3 No. 7. 219 These beds form the lowest portion of the Carboniferous formation, lying below the Productal and Encrinal Mountain Limestone of Northumberland, and might properly be designated as the Tuedian group... Specimens of these fossils were exhibited by Mr. Tate. 1859 Tate in Hist. Berwickshire Naturalists' Club IV. No. 3. 151 In 1856, I applied this name [Tuedian] to a series of beds, lying below the Mountain Limestone, which are largely developed on the Tweed. 1876 D. Page Adv. Text-bk. Geol. (ed. 6) xiv. 240 The term Calciferous sandstones..is sometimes employed, as well as the more strictly local one of Twedian beds. 1882 G. A. Lebour in Hist. Berwickshire Naturalists' Club 9 No. 3. 527 This great division..has been..split into two members, the Bernician above,..and the Tuedian below, the equivalent of the Calciferous Sandstone Series and part of the Upper Old Red Sandstone of Scotland. This entry has not yet been fully updated (first published 1915; most recently modified version published online December 2020). < adj.1856
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