Precambrian is a geologic period that extends as back as 4.500 million years ago. Fossils are very rare from that period of time.
very little, there are stromatolites, domed mates of microscopic algae that are aged as precambrian. No other fossils in the precambrian
precambrian
20,000 b.c.
correlation between rock units is impossible
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.
Stromatolites
Yes, although the fossil record for the precambrian period is scarce. See related link.
stromatolites
very little, there are stromatolites, domed mates of microscopic algae that are aged as precambrian. No other fossils in the precambrian
The lack of Precambrian fossils is mainly due to the soft-bodied nature of organisms during that time, which did not easily fossilize. Additionally, geological processes over billions of years have often destroyed or altered any existing Precambrian fossils.
The lack of hard parts in organisms during the Precambrian period is a factor that prevents us from finding fossils. The geological processes over time, including erosion and metamorphism, may have also destroyed many Precambrian fossils. Additionally, the scarcity of exposed Precambrian rocks due to tectonic activity can make it difficult to find these ancient fossils.
precambrian
unicellular prokaryoytes
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.
One reason for the lack of Precambrian fossils is the soft-bodied nature of the organisms living during that time, which made preservation difficult. Additionally, geological processes like erosion and tectonic activity have destroyed many of the Precambrian rocks that could have contained fossils. Finally, the Precambrian era was a time of lower oxygen levels, which may have hindered the evolution of complex multicellular life forms that are more likely to fossilize.
Most rocks from that era are deeply buried.
stromatolites