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Cyanobacteria fossils can be dated back to the what while fossils of icthyosaurs indicate that they live during the what?
Cyanobacteria fossils are the oldest known fossils on Earth. Stromatolites found near Shark Bay, Western Australia, which are made by cyanobacteria, have been dated back to 3.5 billion years in the Paleoarchean Era . They survive to modern day. Identical stromatolites are being formed not 15 miles from there 3.5 billion year old fossilised ancestors.
Icthyosaurs on the other had appeared in the fossil record about 245 million years ago in the Middle Triassic Epoch. They died out about 90 million years ago in the Upper Cretaceous Epoch, about 25 million years before the KT extinction that saw the deaths of the other great marine reptiles the mosasaurs and the pleisoasurs as well as all non avian dinosaurs.
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What are remains of plants and animals that were buried very quickly in sediment during floods?
fossils
Index fossils during triassic period?
Some index fossils during the Triassic period include ammonites, conodonts, and certain marine reptiles like nothosaurs and thalattosaurs. These fossils are used by paleontologists to help date and correlate rock layers from that time period. They provide important information about the environments and life forms of the Triassic era.
What information did geologists use to develop the geologic time scale?
Geologists used a combination of fossil evidence, rock layers, and radiometric dating techniques to develop the geologic time scale. Fossils provide a record of past life forms, while rock layers indicate the relative ages of different geological events. Radiometric dating allows for assigning numerical ages to specific rock formations.
Do fossils go through the rock cycle and if they do do they get melted?
Fossils can be buried and subjected to heat and pressure during the rock cycle, but they do not usually melt. Instead, the organic material in fossils can be transformed into carbon-rich substances like graphite or coal under high temperature and pressure conditions. In some cases, fossils may be destroyed or altered by extreme heat, but melting is not a common outcome.
How the fossils record supports the theory of punctuated equilibrium?
the fossils show massive change at one time (for instance the Grand Canyon; this massive change occurs usually from significant weather/environmental events) , and during the periods between the significant changes not much evolution (changes in genetic expression/genes) occurs.
In what era did cyanobacteria appear?
Cyanobacteria fossils can be dated back to the Proterozoic Era.
What gas does cyanobacteria create during photosynthesis?
oxygen
Cyanobacteria are as significant to this process today as they were during precambrian time?
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Why does thylakoid membranes of chloroplasts resemble those of cyanobacteria?
Thylakoid membranes of chloroplasts resemble those of cyanobacteria because chloroplasts are believed to have evolved from endosymbiotic cyanobacteria. During evolution, the cyanobacteria that were engulfed by a host cell eventually became mutually beneficial, leading to the development of chloroplasts. The structural similarity between the thylakoid membranes of chloroplasts and cyanobacteria is a remnant of this evolutionary relationship.
What are the ichthyosaurus and plesiosaurus?
Plesiosaurs and icthyosaurs were two unrelated groups of marine reptiles that lived during the Mesozoic. Plesiosaurs had long necks and short tails, or short necks and long tails, and they propelled themselves using their flippers. Icthyosaurs were reptiles that looked much like fish, with a long narrow snout, and a vertical tail fin. Both plesiosaurs and icthyosaurs ate marine animals.
What are remains of plants and animals that were buried very quickly in sediment during floods?
fossils
What waste product does cyanobacteria produce?
photosynthesis
What name is given to fossils that are widespread geographically?
Fossils that are widespread geographically are commonly referred to as cosmopolitan fossils. These fossils are found in multiple locations around the world, indicating a broad distribution during the time period in which they were alive.
Are fossils chemical or mechanical weathering?
Fossils are nothing to do with weathering they are formed during the deposition of sediments before they become rocks.
The fossils of organisms that were widely distributed but only lived during a short period of time are called?
They are called index fossils.
Fossil used to compare the relative ages of fossils?
Index fossils are used to compare the relative ages of fossils. These are fossils that are known to have lived during a specific time period, helping to date the rock layers in which they are found. By identifying and comparing index fossils, scientists can determine the relative ages of different rock layers and fossils.
What marine creatures lived during the Jurassic period?
Marine creatures like sharks existed in the Jurassic. Marine reptiles like icthyosaurs, plesiosaurs, and thalattosuchians also existed. Thalattosuchians are fully marine reptiles.
