Relationship To Earth's Geologic Time Scale
Since little or no geological evidence on Earth exists from the time spanned by the Pre-Nectarian period of the Moon, the Pre-Nectarian has been used as a guide by at least one notable scientific work to subdivide the unofficial terrestrial Hadean eon. In particular, it is sometimes found that the Hadean eon is subdivided into the Cryptic era and Basin Groups 1-9 (which collectively make up the Pre-Nectarian), and the Nectarian and Lower Imbrian. The first lifeforms (self replicating RNA molecules, see RNA world hypothesis) may have evolved on earth around 4 bya during this era.
| Hadean Eon | |||
|---|---|---|---|
| The Hadean doesn't have any recognizable subdivisions categorized by the International Commission on Stratigraphy. The following subdivisions represent one proposal that is loosely based on the lunar geologic time scale. | |||
| Cryptic | Basin Groups | Nectarian | Lower Imbrian |
Read more about this topic: Basin Groups
Famous quotes containing the words relationship, earth, time and/or scale:
“Our mother gives us our earliest lessons in love—and its partner, hate. Our father—our “second other”Melaborates on them. Offering us an alternative to the mother-baby relationship . . . presenting a masculine model which can supplement and contrast with the feminine. And providing us with further and perhaps quite different meanings of lovable and loving and being loved.”
—Judith Viorst (20th century)
“It sometimes strikes me that the whole of science is a piece of impudence; that nature can afford to ignore our impertinent interference. If our monkey mischief should ever reach the point of blowing up the earth by decomposing an atom, and even annihilated the sun himself, I cannot really suppose that the universe would turn a hair.”
—Aleister Crowley (1875–1947)
“She is a theme of honor and renown,
A spur to valiant and magnanimous deeds,
Whose present courage may beat down our foes,
And fame in time to come canonize us.”
—William Shakespeare (1564–1616)
“I have spent all my life under a Communist regime, and I will tell you that a society without any objective legal scale is a terrible one indeed. But a society with no other scale but the legal one is not quite worthy of man either.”
—Alexander Solzhenitsyn (b. 1918)