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Mammals actually first came into existence about 220 million years ago, which is about 155 million years before the dinosaurs went extinct, and only about 10 million years after they themselves first evolved. So mammals actually lived alongside the dinosaurs, though played a much smaller role.
What else can I help you with?
Why is it impossible for a cat fossil to be found in the same sedimentary rock layer as a dinosaur fossil?
Because the layer dinosaur fossils are located are from time period and the fact there were no mammals (cat like) on that time, makes it impossible for cats to be found on that layer. Actually the first mammals appear in the fossil record about the same time as the first dinosaurs, but until at the time the dinosaurs died out (65 million years ago) no mammal was quite as large as the modern cat (most were the size of rats or smaller). The first cats (and "dogs") did not appear until about 50 million years ago.
When did mammals appear in the fossil records?
40 million years agoThey started appearing in the Cenozoic period.
What to animal groups for which there is a good fossil record showing their evolutionary development?
Some animal groups with a good fossil record showing their evolutionary development include dinosaurs, mammals, and marine invertebrates like trilobites. Fossil evidence of these groups has allowed scientists to trace their evolutionary history and understand how they diversified and adapted over time.
When did mammals first appear on earth by paleontologists?
Mammals first appear in the fossil record of the Mesozoic Era.
Did dinosaurs evolve into birds before or after a meteor killed all the dinosaurs?
Birds evolved in the late Jurassic Period about 150 to 145 million years ago. This was about 90 to 95 million years before the asteroid impact that marked the K-T extinction event.Just a sub note that most scientist recognise that birds are a specialised branch of the therapod dinosaur. Birds are dinosaurs in the same way cats are mammals.
Did mammals appear in the fossil record after dinosaurs became extinct?
No, mammals lived alongside dinosaurs and their earliest known fossils of about 200 million years old are almost contemporary with the early dinosaur fossils.
What is true of the fossil record of mammalian origins?
The fossil record shows that mammals and the great dinosaurs shared the same times. It also shows that mammals made a major surge in population when the dinosaurs died out.
When do small mammals appear in fossil records?
During the KT extinction event the majority of life on earth became extinct. Small mammals, however, were able to survive this mass extinction.
Why is it impossible for a cat fossil to be found in the same sedimentary rock layer as a dinosaur fossil?
Because the layer dinosaur fossils are located are from time period and the fact there were no mammals (cat like) on that time, makes it impossible for cats to be found on that layer. Actually the first mammals appear in the fossil record about the same time as the first dinosaurs, but until at the time the dinosaurs died out (65 million years ago) no mammal was quite as large as the modern cat (most were the size of rats or smaller). The first cats (and "dogs") did not appear until about 50 million years ago.
How can you tell a reptile's fossil from a dinosaurs fossil?
a dinosaurs fossil is alot bigger than a retile's
When did mammals appear in the fossil records?
40 million years agoThey started appearing in the Cenozoic period.
What evidence is there from fossils to suggest that reptiles lived before mammals?
The best evidence for the existence of dinosaurs are thousands of fossilized dinosaur skeletons of hundreds of dinosaur species. There are also fossil footprints, skin impressions, and, in a few rare cases, dinosaurs mummified and fossilized, preserving skin.
When did the dinosaurs first appear?
They appear in the fossil record in the late Triassic about 230 million years ago and go extinct around 65 mya.
What to animal groups for which there is a good fossil record showing their evolutionary development?
Some animal groups with a good fossil record showing their evolutionary development include dinosaurs, mammals, and marine invertebrates like trilobites. Fossil evidence of these groups has allowed scientists to trace their evolutionary history and understand how they diversified and adapted over time.
When did mammals first appear on earth by paleontologists?
Mammals first appear in the fossil record of the Mesozoic Era.
In general the first mammals of any group to appear in the fossil record?
resembled dogs and cats
Where are fossil fuels from?
Dead dinosaurs.
