Pebidianadj.n.

Brit.

/pɛˈbɪdɪən/,

/pəˈbɪdɪən/, U.S.

/pəˈbɪdiən/

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

Etymology: < Pebidi- (in Pebidiog (formerly Pebidiauc ), the name of a district in Pembrokeshire, Wales, where the rock is exposed (see quot. 1877 at sense A.)) + -an suffix; compare -ian suffix. Compare Demetian adj. and n.

Geology.

A. adj.

Designating a thick sequence of volcanic rocks of Precambrian age with outcrops in several areas in south-western Wales.

ΘΚΠ

the world > the earth > structure of the earth > age or period > stratigraphic units > [adjective] > pre-Cambrian > specific

Huronian1854

Lewisian1859

Archaean1872

Torridon1873

Keweenawan1876

Pebidian1877

Malvernian1879

Longmyndian1887

Torridonian1893

Moinian1938

Laxfordian1950

1877 H. Hicks in Q. Jrnl. Geol. Soc. 23 230 I propose now to divide the Pre-Cambrian rocks [in the vicinity of St David's] into two distinct series under the local names of Dimetian..for the lower, and Pebidian (Pebidiauc being the name of the division or hundred in which the rocks are chiefly exposed) for the upper series.

1891 Amer. Naturalist 25 571 He thinks..that some quartzites, porcellanites, and schists occupy an intermediate position in point of age between these granitoid rocks and the Pebidian series.

1937 J. Pringle & T. N. George S. Wales ii. 15 In the neighbourhood of St. David's, the Pebidian tuffs occupy a broad anticlinal area which extends inland for several miles in an east-north-east direction.

1995 Geol. Mag. 132 340/1 The Pebidian Supergroup, which crops out chiefly in North Pembrokeshire, comprises basic, intermediate, and silicic..rocks.

B. n.

The Pebidian sequence.

ΚΠ

1880 Q. Jrnl. Geol. Soc. 36 538 I have long been disposed to consider the felspathic series in Shropshire, or at least the Lilleshall group, as representing the Pebidian.

1883 Science 15 June 541/1 The Pebidian consists of a series of volcanic tufas and breccias, with interstratified and intrusive lavas.

1969 G. M. Bennison & A. E. Wright Geol. Hist. Brit. Isles iv. 80 The Caerfai Series commences with a reddish basal conglomerate, some of the pebbles being derived from the adjacent Precambrian volcanics, the Pebidian.

This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).

单词	pebidian
释义	Pebidianadj.n. Brit. /pɛˈbɪdɪən/, /pəˈbɪdɪən/, U.S. /pəˈbɪdiən/ Origin: From a proper name, combined with an English element. Etymons: proper name Pebidiog , -an suffix. Etymology: < Pebidi- (in Pebidiog (formerly Pebidiauc ), the name of a district in Pembrokeshire, Wales, where the rock is exposed (see quot. 1877 at sense A.)) + -an suffix; compare -ian suffix. Compare Demetian adj. and n. Geology. A. adj. Designating a thick sequence of volcanic rocks of Precambrian age with outcrops in several areas in south-western Wales. ΘΚΠ the world > the earth > structure of the earth > age or period > stratigraphic units > [adjective] > pre-Cambrian > specific Huronian1854 Lewisian1859 Archaean1872 Torridon1873 Keweenawan1876 Pebidian1877 Malvernian1879 Longmyndian1887 Torridonian1893 Moinian1938 Laxfordian1950 1877 H. Hicks in Q. Jrnl. Geol. Soc. 23 230 I propose now to divide the Pre-Cambrian rocks [in the vicinity of St David's] into two distinct series under the local names of Dimetian..for the lower, and Pebidian (Pebidiauc being the name of the division or hundred in which the rocks are chiefly exposed) for the upper series. 1891 Amer. Naturalist 25 571 He thinks..that some quartzites, porcellanites, and schists occupy an intermediate position in point of age between these granitoid rocks and the Pebidian series. 1937 J. Pringle & T. N. George S. Wales ii. 15 In the neighbourhood of St. David's, the Pebidian tuffs occupy a broad anticlinal area which extends inland for several miles in an east-north-east direction. 1995 Geol. Mag. 132 340/1 The Pebidian Supergroup, which crops out chiefly in North Pembrokeshire, comprises basic, intermediate, and silicic..rocks. B. n. The Pebidian sequence. ΚΠ 1880 Q. Jrnl. Geol. Soc. 36 538 I have long been disposed to consider the felspathic series in Shropshire, or at least the Lilleshall group, as representing the Pebidian. 1883 Science 15 June 541/1 The Pebidian consists of a series of volcanic tufas and breccias, with interstratified and intrusive lavas. 1969 G. M. Bennison & A. E. Wright Geol. Hist. Brit. Isles iv. 80 The Caerfai Series commences with a reddish basal conglomerate, some of the pebbles being derived from the adjacent Precambrian volcanics, the Pebidian. This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022). < adj.n.1877
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