540 Million years ago
Geologic records evidence of abundant fossil is 540 Million Years ago during the Paleozoic Era.
A trace fossil is one that merely indicates that an organism left evidence of its existence. Some examples would be burrows or footprints that appear in sedimentary rock. An index fossil is of an organism that dates to a particular time in the geologic record, the organism only appearing in a certain segment of that record. Index fossils are indicators of the age of the rock in which they are found.
Cyanobacteria are the first to appear in the fossil record.
Graptolites were hemichordates that appear in the fossil record resembling a series of sawblade teeth. They are good index fossils for the Ordivician and Silurian geologic time periods.
It measures the age of a fossil.:)
Geologic records evidence of abundant fossil is 540 Million Years ago during the Paleozoic Era.
Abundant and diverse fossils first appeared in the Cambrian era, although there is fossil evidence throughout much of the Precambrian.
The first abundant fossil evidence first appeared during the Paleozoic Era. It was the first era of the Phanerozoic Eon, which occurred 540 million years ago.
540 Million years ago
The planet Earth is about 4,600 million years old. Fossil evidence becomes abundant in the geological record in the Cambrian Era, which was about 550 million years ago (when hard shelled animals appeared) Therefore (550/4600)*100 = roughly 12% of Geological time contains abundant fossil evidence. However, please note that (non abundant) fossil evidence goes back about 3600 million years, (3600/4600)*100 = roughly 73% of Geologic time.
they use major fossil records
There are technically more than three traits and those traits are distinctive, widespread, abundant and limited in geologic time.
A trace fossil is one that merely indicates that an organism left evidence of its existence. Some examples would be burrows or footprints that appear in sedimentary rock. An index fossil is of an organism that dates to a particular time in the geologic record, the organism only appearing in a certain segment of that record. Index fossils are indicators of the age of the rock in which they are found.
Cyanobacteria are the first to appear in the fossil record.
Graptolites were hemichordates that appear in the fossil record resembling a series of sawblade teeth. They are good index fossils for the Ordivician and Silurian geologic time periods.
Fossil evidence of Cyanobacteria indicates an age of up to 2.8 billion years.
Precambrian