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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.

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For which segment of the Earth's geologic history are fossils rarely found?

precambrian


Fossils of organisms found in the early precambrian are all of?

unicellular prokaryoytes


Why are fossils rarely found?

They have no bones.


Where in the fossil record can you find fossils of the oldest life forms?

The fossils of the oldest life forms can be found in the Precambrian period of the fossil record.


Why is Precambrian history more difficult to study than more recent geological history?

Precambrian history is more difficult to study because the rocks from this era have undergone significant alteration and destruction over billions of years, making them harder to interpret. Also, the lack of well-preserved fossils in Precambrian rocks makes it challenging to reconstruct ancient environments and ecosystems accurately. Additionally, the vast timescale of the Precambrian era poses difficulties in accurately dating events and establishing a precise chronology of geological events.


Why are shark teeth often found as fossils but impressions of jellyfish are rarely found?

Because shark teeth are hard enough to be fossilized


Why shark teeth are often found as fossils but impression of jellyfish are rarely found?

Because shark teeth are hard enough to be fossilized


Are fossils abundant in all types of rocks?

no they are not. If you go outside and look around and look at all types of rocks you will probably not find a fossil. Fossils are rarely found.


What is the age of fossils that can be measured by what dating?

Fossils themselves can very rarely be dated by any means...their age is usually judged by the geological assessment of the area and layer in which they are found


Why are there few fossils from the precambrian era?

Actually, it isn't really true! We now know (unlike Darwin who would have rejoiced to know what we now know!) that fossils in the PreCambrian are numerous and spread world-wide. But many are very small and not easily recognised or exist in specialised geologically circumstance, often preserved in relatively little-known places. Much PreCambrian rock is igneous, products of vulcanism, and obviously do not preserve fossils. But where suitable conditions prevailed, unusual fossils can be found are a the subject of a great deal of study. Many of the best preserved are where fine volcanic ash settled over the ancient seabed preserving the soft-bodied forms which were around 500-600ma ago. Precambrian fossils may be found at several localities in UK (notably Charnwood Forest in Leicestershire), in Canada, Namibia, Russia, China and especially in Australia.


Which type of fossils is found only rarely?

Maybe a T rex or some other kind of dinosaur


What kind of animals developed near the end of first era?

Animals without backbones, called invertebrates, developed near the end of the Precambrian. Imprints of jellyfish and marine worms have been found in late Precambrian rocks. Because invertebrates were soft, they weren't easily preserved as fossils. This is one of the reasons why the Precambrian fossil record is so sparse.