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welll ya see there was lots of little critters walking around and ya know its funyn cus that is it! ha
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∙ 11y ago
Flips1223 Boy
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What time spans occurred first?
Precambrian
When did Precambrian Time begin?
The Precambrian period was from 4600 million years ago to about 542 million years ago.
How long did the PreCambrian era last?
The Precambrian Era. The name means: "before the Cambrian period." This old, but still common term was originally used to refer to the whole period of earth's history before the formation of the oldest rocks with recognizable fossils in them. In the last few decades, however, geologists have found that there are some hard-to-discern fossils in some Precambrian rocks, so this period is now also known as the Cryptozoic or "obscure life" Eon (from the words "crypt" = "hidden," and "zoon" = "life"). The Precambrian covers almost 90% of the entire history of the Earth. It has been divided into three eras: the Hadean, the Archean and the Proterozoic. Source: Unknown The Precambrian Era comprises all of geologic time prior to 600 million years ago. The Precambrian was originally defined as the era that predated the emergence of life in the Cambrian Period. It is now known, however, that life on Earth began by the early Archean and that fossilized organisms became more and more abundant throughout Precambrian time. The two major subdivisions of the last part of the Precambrian are the Archean (oldest) and the Proterozoic. Rocks younger than 600 Ma are considered part of the Phanerozoic.
What were the dominant animals in the preCambrian era?
The dominant organisms during the Precambrian include the proarticulatans, such as Dickinsonia, Yorgia, and Praecambridium which were a group of "air-mattress" organisms possibly related to modern day placozoans, rangeomorphs, such as Rangea, and Charnia, which were frond-shaped organisms that had bilateral to radial symmetries, and the trilobozoans, like Tribrachidium, which were disk-like organisms with a tri-radial symmetry, possibly related to cnidarians.The ancestral mollusk, Kimberellia, is found throughout Precambrian strata of the world.There were also sponges, and what have been interpreted as the polyps and medusae of cnidarians during the Precambrian, as well. Very primitive worms and arthropods appear at the very end of the Precambrian, as it transitions into the Cambrian period.
Which gas did volcanoes not produce in the Precambrian era?
Oxygen
What dangers might travelers face if they go back in time to the Precambrian earth?
You can't go back in time , but I'd take an assualt rifle . goodluck
Why is it difficult to study Precambrian time?
There is not many remains of the Precambrian time
Is the Earth's surface hot or cool in the Precambrian Time?
It is hot in the Precambrian time
What was the longest segment of the earth's history?
It was the Precambrian time period.
Why is the shield also referred to as the Precambrian Shield?
Because it was created in the precambrian era...The Candadian Shield was formed in the Precambrian Era.The rocks of the Canadian Shield formed during the Precambrian time.
Why is the Canadian Shield also referred as the Precambrian Shield?
Because it was created in the precambrian era...The Candadian Shield was formed in the Precambrian Era.The rocks of the Canadian Shield formed during the Precambrian time.
Why is the Canadian Shield also referred to as the Precambrian Shield?
Because it was created in the precambrian era...The Candadian Shield was formed in the Precambrian Era.The rocks of the Canadian Shield formed during the Precambrian time.
Which is the largest of time on the geologic time scale?
The Precambrian
Why is the Precambrian time period segmented into very few parts?
The Precambrian time period is segmented into very few parts because:
Is the Precambrian time the longest or shortest part of Earth's history?
The Precambrian time period is the longest time period of Earth's history.Looks like we have the same worksheet in school :)
geologic time with poorest fossil record?
Precambrian time.
A life-form in the Precambrian time was?
cyanobacteria
