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A widely distributed sedimentary structure consisting of laminated carbonate or silicate rocks, produced over geologic time by the trapping, binding, or precipitating of sediment by groups of microorganisms, primarily cyanobacteria.
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∙ 16y ago
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∙ 14y agoStromatolites are formed through the trapping of sediments and the precipitation of calcium carbonate in response to the growth and metabolic activities of matlike cyanobacteria colonies. Due to the matlike growth of the cyanobacteria, laminar sedimentary structures are formed.
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∙ 16y agoIt is one of the oldest fossils in the world, made from algea.
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∙ 13y agoStromatolites are believed to be the fossils of colonies of photosynthetic bacteria. Like any fossil, stromatolites are made of minerals.
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∙ 14y agofound today in some warm, shallow, salty bays
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∙ 13y agoThey converted the early earth atmosphere from a deadly mix of gases to the oxygen rich atmosphere we have now.
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∙ 9y agoA stromatolite mound made up of layers of cyanobacteria and trapped sediment. It secretes lime and is the earliest known fossils. It is still being formed in Australasian lagoons.
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What fossil records do you have from the Precambrian life?
very little, there are stromatolites, domed mates of microscopic algae that are aged as precambrian. No other fossils in the precambrian
Fossilized evidence of Earth's first forms of life would consist of?
The earliest fossils known are in the form of stromatolites formed by cyanobacteria about 3.5 billion years ago. To say however that these are the first life forms is not likely to be correct. Cyanobacteria are already a relatively complex single celled organism. It is likely that simpler forms preceded them but so far no evidence of this has been found.
Why is there a gap of time between the evolution of algae and trilobites?
There isn't, of course, a gap in time. There are, however, very few fossils intermediate between simple stromatolites (the first more or less multicellular organisms) and the first complex organisms found just before the Cambrian Explosion. This gap most likely exists because while predation already existed (organisms consuming other organisms), no organisms had yet developed an internal or external skeleton that could have been preserved at death. The very few organisms from that era that were preserved despite of this, were preserved in the form of molds and casts.
What organism took the longest time to evolve?
Well, it is either a turtle or an alligator because they are very wise and I think they were living at the time of the dinosaurs. Thank You!P.S. I think more of the Turtle because I saw it on a documentary!That is of course if you are ruling out zooplankton.
Many of the oldest known fossils most closely resemble which modern organisms?
Wolves have changed some over the past 20 million years, but not by a huge amount. There are fossils of mosquitoes in amber that are remarkably similar to modern mosquitoes, though they are over 200 million years old. Coelacanth is a variety of fish for which modern specimens are somewhat similar to species that lived at the close of the Cretaceous, 65 million years ago. So there are a few creatures that have not changed a whole lot over vast stretches. Horseshoe crabs are yet another example, for which there are specimens over 440 million years old.
When did Stromatolites become extinct?
The are examples of stromatolites still living. They are not extinct.
What (who)are stromatolites?
The stromatolites are the layered mounds, columns, and the sheet-like sedimentary rocks.
What have scientist inferred from fossil stromatolites?
Stromatolites were much more abundant on the planet in Precambrian times which means that fossils found around stromatolites are typically from the Precambrian era.
What are found on the outer surfaces of stromatolites?
Biofilms of microorganisms, especially cyanobacteria, are found on the outter surfaces of stromatolites.
What are the oldest fossils?
Stromatolites.
How is a structure built?
Stromatolites
During which period did the presence of stromatolites decline?
Proterozoic is called the "Age of Stromatolites" (Abundant in Proterozoic shallow seas)
What fossils are from the Precambrian era?
Stromatolites
Are structures built by cyanobacteria.?
stromatolites
What structures are built by cyanobacteria?
stromatolites
What are the most common precambrian fossils are?
stromatolites
The type of organisms that create stromatolites?
cyanobacteria
