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The Cambrian Era saw the arrival of species that had skeletons or at least carapaces.
Prior to this, there were indeed soft-bodied animals such as worms and jellyfish, but these type of tissue do not preserve well, and in addition they are very prone to scavenging by bacteria and so on.
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One reason fossils are rarely found in Precambrian rocks is that?
Precambrian rocks contain relatively fewer fossils than rocks from different eras. This may be due to the fact that the rocks from this era were subject to a lot of heat and pressure, or were exposed to erosion.
Which factor prevents us from finding precambrian fossils?
Most rocks from that era are deeply buried.
What are two characteristics of precambrian rocks?
Nickel and Iron
What types of rocks contain fossils?
Igneous rocks and most metamorphic rocks, of an igneous origin.
Does igneous sedimentary and metamorphic rocks contain fossils?
No. In general, there are no fossils in igneous or metamorphic rocks, because the high heat and pressure involved would destroy any fossils. Fossils are almost always found in sedimentary rock.
One reason fossils are rarely found in Precambrian rocks is that?
Precambrian rocks contain relatively fewer fossils than rocks from different eras. This may be due to the fact that the rocks from this era were subject to a lot of heat and pressure, or were exposed to erosion.
Precambrian are fossils yes or no?
Precambrian is a geologic period that extends as back as 4.500 million years ago. Fossils are very rare from that period of time.
What is the Difference between Precambrian rocks and Paleozoic rocks?
Paleozoic rocks contain fossils while Precambarian rocks had no fossils since at that time there was only single celled organisms.
What prevents us from finding precambrian fossils?
Most rocks from that era are deeply buried.
What conspicuous difference is there between precambrian sedimentary rocks and those formed in later eras?
No fossils.
Are precambrian rocks common?
No. Precambrian rocks are exceptionally rare. That period ended 570 million years ago, and the oldest rocks on the surface of the Earth are in the Laurentian Range, which runs from Southern Quebec down into Texas and Mexico.
What fossils are from the Precambrian era?
Stromatolites
When were precambrian rocks formed?
During the precambrian.
Is it true Numerical age dates based on radioactivity are very important for studying Precambrian geologic history because fossils are rare or absent?
true?
What are the most common precambrian fossils are?
stromatolites
Why is it rare to fine fossils in metamorphic rocks?
Fossils abound in sedimentary rock, you are in fact very likely to find them there.
What are the most common precambrian fossils called?
stromatolites
