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Cyanobacteria fossils can be dated back to the what while fossils of icthyosaurs indicate that they live during the what?
Wiki User
∙ 14y ago
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.
Wiki User
∙ 14y ago
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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?
Tropites subbullatusMonotis subcircularis
What information did geologists use to develop the geologic time scale?
Radiometric dating and association of fossils with time scales during the periods when life existed.
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.
What does slight antalgic gait?
This would indicate that most likely the person or animal is demonstrating a visible asymmetry during walking as a result of pain.
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 remains of plants and animals that were buried very quickly in sediment during floods?
fossils
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 major change occurred in the atmosphere during the precambrian?
The atmosphere, during the Precambrian became richer in oxygen caused by a bacteria called cyanobacteria.
Was cyanobacteria the first to exist or dinosaurs?
Cyanobacteria. Cyanobacteria are among the earliest forms of life and are thought to have evolved approximately 2.5 billion years ago. These bacteria are thought to have changed the atmosphere of the planet via nitrogen fixation. The first dinosaurs evolved approximately 250 million years ago during the late Triassic.
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.
Index fossils during triassic period?
Tropites subbullatusMonotis subcircularis
Fossils of fish appeared approximately 500 mya during the?
Cambrian
