-
The Precambrian Time period is basically the time period from 542-3600 B.C
-
-
The second half of Precambrian time is marked by a slow evolution of the Earth toward its modern appearance. But this period had its own precarious and bizarre events, just as did the Archean and Hadean eons before it.
-
The first proper animals arose. New, more complex organisms that could live in the oxidizing environment arose. These later gave rise to the animals and plants, and the ancient anaerobes retreated. Whether from evolutionary progress or from changes in geochemistry, animals gained the ability to build hard body parts of carbonate minerals.
-
This time period is between 253.8-513
-
It was during the Archean Eon (3800-2700 Mya) that the first organic lifeforms developed out of a mixture of inorganic compounds. The oldest known prokaryotic fossils date back to the Archean Eon. The Proterozoic Eon (2700-590 Mya) gave rise to the first eukaryotic fossils (algae).
-
The time period is between 70-249
-
some 440 million years ago. Nearly half of the brachiopods and bryozoans perished. The trilobites were devastated. In all about 100 families of marine invertebrates went extinct. (There was no life on land at this time.)
-
Connecticut had an active youth with lots of landmasses colliding and breaking apart, mountain ranges rising and being eroded, their sediments washing into nearby marine basins. It has been part of several different ancient landmasses: Rodinia, Pangea, Laurasia, Avalonia. The continent ripped open there during the Late Proterozoic era 700 million years ago, giving birth to an ocean named Iapetus. Then Iapetus's edges came together again squeezing the sea out of existence.
-
the period of time when the Cenozoic time era cam about was between 0.0115-61.7 (i have no idea if thats right or if thats even a time period)
-
The Paleozoic Era (590-248 Mya) is an exciting time in the history of life that begins with aquatic life and ends with a diverse collection of organisms including insects, amphibians, plants, fishes, and reptiles. Scientists divide the Paleozoic Era era into six periods:
