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40 million years ago
They started appearing in the Cenozoic period.
Alexandrine Nienow
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When did mammals first appear on earth by paleontologists?
Mammals first appear in the fossil record of the Mesozoic Era.
What fossil records tell us that elephants have evolved?
There are absolutely no fossil records of any elephants evolving, actually, there are no fossil records of anyanimal evolving.
When did the Equus first appear in the fossil record?
when did the equus frist appear in the fossil record
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.
Why it is hard to find fossil records in layers of rock.?
because it hiding in the records of the rock
When did modern humans appear on earth according to fossil records?
According to the fossil records, the modern humans did appear on earth more than 130,000 years ago.
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.
Are fossils records complete or incomplete?
Fossil records are not complete. By some estimates, less than 1% of organisms that have lived appear in the fossil record.
Abundant fossil evidence did not appear in the geologic record until about?
Geologic records evidence of abundant fossil is 540 Million Years ago during the Paleozoic Era.
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
What fossil records tell us that elephants have evolved?
There are absolutely no fossil records of any elephants evolving, actually, there are no fossil records of anyanimal evolving.
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 has the author Mietje Germonpre written?
Mietje Germonpre has written: 'The Belgian quaternary mammals' -- subject(s): Bibliography, Fossil Mammals, Mammals, Fossil, Paleontology
What fossil records tell about seedless plant that lived on earth long ago?
What fossil records tell about seedless plants that lived on earth long ago?
When did the Equus first appear in the fossil record?
when did the equus frist appear in the fossil record
What has the author William Wise written?
William Wise has written: 'Nanette the hungry pelican' 'The world of giant mammals' -- subject(s): Fossil Mammals, Mammals, Fossil 'The cowboy surprise' 'The terrible trumpet'
