Keweenawanadj.

/kiːwiːˈnɔːən/

Forms: Also †Keweenawian.

Etymology: < the name of Keweenaw Peninsula, Michigan + -an suffix, -ian suffix.

Of, pertaining to, or designating the most recent division of the Proterozoic in North America, as represented by rocks in the region of the Great Lakes. Also absol., the Keweenawan period or rocks.

ΘΚΠ

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

Keweenawan1876

Algonquian1889

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

Huronian1857

Labradorian1870

Keweenawan1876

sparagmite1882

Keewatin1886

Torridonian1893

Laxfordian1950

the world > the earth > structure of the earth > age or period > [noun] > Pre-Cambrian > Proterozoic > specific

Keweenawan1876

Keewatin1886

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

1876 T. B. Brooks in Amer. Jrnl. Sci. 111 210 We are therefore justified, I think, in regarding the Copper~bearing rocks of Lake Superior as a distinct and independent series, marking a definite geological period which separates the Silurian from the Huronian ages... Since Keweenaw Peninsula forms one of the most striking geographical features in Lake Superior.., I suggest the name Keweenawian for this period.

1883 R. D. Irving Copper-bearing Rocks Lake Superior ii. 25 The Keweenawan rocks form the larger part of Keweenaw Point.

1893 Jrnl. Geol. (Chicago) 1 126 The source of the lavas of the Keweenawan.

1906 T. C. Chamberlin & R. D. Salisbury Geol. II. 198 The Keweenawan system contains the most extensive deposits of native copper known.

1913 A. P. Coleman Proterozoic Canad. Shield (1915) 151 The volcanic eruptions so characteristic of the later Keweenawan.

1930 Econ. Geol. XXV. 252 Erosion had peneplained the original folds of the Keewatin and Timiskaming rocks before Keweenawan time.

1930 Econ. Geol. XXV. 262 They are distinctly younger than the Algoman and older than the Keweenawan.

1935 Bull. Geol. Soc. Amer. 46 504 The Keweenawan lavas of the Lake Superior district form the inner border of the Lake Superior syncline. They crop out over an area of several thousand square miles, and in one section on Keweenaw Point, Michigan, form a series with a minimum thickness of 15,000 feet.

1970 J. A. Dorr & D. F. Eschman Geol. Michigan iv. 56/1 Keweenawan lavas were derived from molten magmas of the ‘basic’ or ferro-magnesian type.

This entry has not yet been fully updated (first published 1933; most recently modified version published online December 2020).

单词	keweenawan
释义	Keweenawanadj. /kiːwiːˈnɔːən/ Forms: Also †Keweenawian. Etymology: < the name of Keweenaw Peninsula, Michigan + -an suffix, -ian suffix. Of, pertaining to, or designating the most recent division of the Proterozoic in North America, as represented by rocks in the region of the Great Lakes. Also absol., the Keweenawan period or rocks. ΘΚΠ the world > the earth > structure of the earth > age or period > [adjective] > pre-Cambrian > proterozoic Keweenawan1876 Algonquian1889 the world > the earth > structure of the earth > age or period > stratigraphic units > [noun] > pre-Cambrian formations Huronian1857 Labradorian1870 Keweenawan1876 sparagmite1882 Keewatin1886 Torridonian1893 Laxfordian1950 the world > the earth > structure of the earth > age or period > [noun] > Pre-Cambrian > Proterozoic > specific Keweenawan1876 Keewatin1886 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 1876 T. B. Brooks in Amer. Jrnl. Sci. 111 210 We are therefore justified, I think, in regarding the Copper~bearing rocks of Lake Superior as a distinct and independent series, marking a definite geological period which separates the Silurian from the Huronian ages... Since Keweenaw Peninsula forms one of the most striking geographical features in Lake Superior.., I suggest the name Keweenawian for this period. 1883 R. D. Irving Copper-bearing Rocks Lake Superior ii. 25 The Keweenawan rocks form the larger part of Keweenaw Point. 1893 Jrnl. Geol. (Chicago) 1 126 The source of the lavas of the Keweenawan. 1906 T. C. Chamberlin & R. D. Salisbury Geol. II. 198 The Keweenawan system contains the most extensive deposits of native copper known. 1913 A. P. Coleman Proterozoic Canad. Shield (1915) 151 The volcanic eruptions so characteristic of the later Keweenawan. 1930 Econ. Geol. XXV. 252 Erosion had peneplained the original folds of the Keewatin and Timiskaming rocks before Keweenawan time. 1930 Econ. Geol. XXV. 262 They are distinctly younger than the Algoman and older than the Keweenawan. 1935 Bull. Geol. Soc. Amer. 46 504 The Keweenawan lavas of the Lake Superior district form the inner border of the Lake Superior syncline. They crop out over an area of several thousand square miles, and in one section on Keweenaw Point, Michigan, form a series with a minimum thickness of 15,000 feet. 1970 J. A. Dorr & D. F. Eschman Geol. Michigan iv. 56/1 Keweenawan lavas were derived from molten magmas of the ‘basic’ or ferro-magnesian type. This entry has not yet been fully updated (first published 1933; most recently modified version published online December 2020). < adj.1876
随便看	thymidylic acid thymier thymiest thymine thymines thyminic thyminic acid thymitis thymo thymo- thymo-nucleic thymo-nucleic acid thymocyte thymocytes thymoform thymol thymolate thymoleptic thymolic thymolize thymoloform thymols thymoma thymomas thymomata