It is so because, the oldest fossils are obtained from the life forms which used to exist at that time in the oldest ages.
At that time there was no so much changes in the world, the life forms being simpler. As the age of the earth advanced hence the forms of life also adapted or tried to adapt to the changes of the surrounding.
The climate changed and so did the life forms. It was determined that in the older times, 1st life forms came in the water bodies and then from there the land forms developed. So as we see the later life forms are more complicated, thus the oldest fossils are more simpler compared to their most recent counterparts.
The oldest known fossils are prokaryotic.
In undisturbed strata, the oldest fossils will be the deepest from the surface.
fish
the oldest fossils can be found the deepest in the ground. in other words, the deeper the fossil, the older it is (unless something has happened to the ground, such as an earthquake etc.)
The worlds oldest fossils were found in an ancient beach in Austrila, they are 3.4 billion years old and are fossils of cells. They have no bones and are mineralized spheres.
It is called so because it is the oldest winged insect alive. Its fossils are 350 million years old.
The oldest known fossils are prokaryotic.
Stromatolites.
The oldest humanoid fossils were all found in Africa.
In undisturbed strata, the oldest fossils will be the deepest from the surface.
Oldest plant Rough Horsetail (Equisetum hyemale) 150 million years old and they are considered living fossils The oldest flower is Montsechia vidalii existed approximately 130 million years ago and it no longer exists
The oldest micro fossils are comprised of carbon. This is because they have been in the ground a very long time and it compresses the materials into carbon.
The oldest known fossils are up to 3.5 billion years old.
The 4th layer of soil >.<
Africa
fish
My grandfather is my oldest living descendant.