Archaeanadj.

Brit.

/ɑːˈkiːən/, U.S.

/ɑrˈkiən/

Etymology: < Greek ἀρχαῖος ancient + -an suffix.

Geology.

Of or pertaining to crystalline rocks of Pre-Cambrian age (see quots.). Also elliptical as n.

ΘΚΠ

the world > the earth > structure of the earth > age or period > [adjective] > pre-Cambrian > Archaean

Archaean1872

Archaeozoic1878

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

1872 J. D. Dana in Amer. Jrnl. Sci. 103 253 I propose to use for the Azoic era and its rocks the general term Archæan.

1881 C. Fish in Pop. Sc. Monthly XIX. 25 The granitic or Laurentian is of archæan origin.

1882 Pall Mall Gaz. 13 Nov. 5/1 The still problematic archæan schists.

1903 A. Geikie Text-bk. Geol. (ed. 4) II. vi. i. 861 Pre-Cambrian, also called Archæan.

1944 A. Holmes Princ. Physical Geol. vii. 104 The term Archæan refers to the oldest Pre-Cambrian crystalline rocks of a given region.

1944 Rastall in Geol. Mag. LXXXI. 159 There is now a marked tendency in international geology to draw a clear distinction between the ancient highly metamorphic continental blocks and the overlying..sedimentary but unfossiliferous groups. These may be conveniently called the Archaean and Algonkian respectively.

This entry has not yet been fully updated (first published 1885; most recently modified version published online December 2021).

单词	archaean
释义	Archaeanadj. Brit. /ɑːˈkiːən/, U.S. /ɑrˈkiən/ Etymology: < Greek ἀρχαῖος ancient + -an suffix. Geology. Of or pertaining to crystalline rocks of Pre-Cambrian age (see quots.). Also elliptical as n. ΘΚΠ the world > the earth > structure of the earth > age or period > [adjective] > pre-Cambrian > Archaean Archaean1872 Archaeozoic1878 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 1872 J. D. Dana in Amer. Jrnl. Sci. 103 253 I propose to use for the Azoic era and its rocks the general term Archæan. 1881 C. Fish in Pop. Sc. Monthly XIX. 25 The granitic or Laurentian is of archæan origin. 1882 Pall Mall Gaz. 13 Nov. 5/1 The still problematic archæan schists. 1903 A. Geikie Text-bk. Geol. (ed. 4) II. vi. i. 861 Pre-Cambrian, also called Archæan. 1944 A. Holmes Princ. Physical Geol. vii. 104 The term Archæan refers to the oldest Pre-Cambrian crystalline rocks of a given region. 1944 Rastall in Geol. Mag. LXXXI. 159 There is now a marked tendency in international geology to draw a clear distinction between the ancient highly metamorphic continental blocks and the overlying..sedimentary but unfossiliferous groups. These may be conveniently called the Archaean and Algonkian respectively. This entry has not yet been fully updated (first published 1885; most recently modified version published online December 2021). < adj.1872
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