Records dating back
Scientists believe that about 4.3 billion years ago, water already existed on Earth's surface.However, what isn't known is when the earliest life emerged.Though there are several Late Proterozoic fossils (both unicellular and multicellular) which superficially resemble green algae, fossils which can be assigned to the group with some confidence are not known earlier than the Cambrian.This is, perhaps in large part, because the group has traditionally been defined by pigment composition, and not with more easily identified morphological characters.The Dasycladales began to rapidly diversify in Middle Ordovician, and are common in all strata until the lower Cretaceous.Both living and extinct species are known primarily from warm marine waters, Many members of the Dasycladales secrete lime (calcium carbonate) which increases their chances for preservation and later discovery as fossils.
We can understand why the ancients would mention solar eclipses since, as such rare events, they involve the blotting out of the sun for a short time in the area of umbra—(the completely dark, inner part of the shadow cast on the earth when the moon covers the sun). C., we have NOT ONE record of a solar eclipse ever having been seen by people!
In the Unites States publicly owned companies often produce an annual report in printed form.
Cities have produced city directories listing all of the businesses in the city and included, in many cases, all of the residents.
(Dave Weatherall) While there is some debate as to whether or not the the age of the rock in the Nuvvuagittuq Greenstone Belt is 3.8 billion years old or 4.3 billion years old, Jonathan O'Neil, assistant professor at the University of Ottawa's Department of Earth and Environmental Sciences, believes it to be on the older side.
But even if the rock is younger than that, it would still make their finding the oldest record of life on Earth, by 100 million years. "We now have evidence in rock that I can hold in my hand that we had life already established extremely early on the Earth." Discoveries such as this one greatly help scientists better understand the early Earth.