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When did large numbers of fossils first appear in the geologic record?
Wiki User
∙ 13y ago
Large numbers of fossils begin to appear around 530 million years ago. It is called the Cambrian Explosion, because it occurred in the Cambrian period. The Cambrian period was the first part of the Paleozoic era.
Wiki User
∙ 13y ago
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Abundant fossil evidence did not appear in the geologic record until what geologic era?
Abundant and diverse fossils first appeared in the Cambrian era, although there is fossil evidence throughout much of the Precambrian.
What are graptolites?
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.
The sum of all the fossils that exist is called the?
The sum of all the fossils that exist is called that fossil record. It includes fossils from all geologic time periods.
When did abundant fossil evidence appear in the geologic record?
540 Million years ago
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.
Why is the Cambrian period a key period in the geologic record?
Because it disproves evolution. Lots of fossils suddenly appearing of fully formed animals. Points to the creator God.
Explain how geologic time is recorded in rock layers?
The strata of sedimentary rock can contain fossils which are peculiar to a specific geologic time. These fossils are referred to as index fossils. Some rock layers also record events such as meteor strikes and periods of volcanism through the deposition of sediments. Igneous rocks in particular contain certain mineral crystals which can be used to provide a radiometric fingerprint of their period of formation.
How is geologic time recorded in rock layers?
The strata of sedimentary rock can contain fossils which are peculiar to a specific geologic time. These fossils are referred to as index fossils. Some rock layers also record events such as meteor strikes and periods of volcanism through the deposition of sediments. Igneous rocks in particular contain certain mineral crystals which can be used to provide a radiometric fingerprint of their period of formation.
How are fossils organized in the fossil record?
Fossils are arragned in sequential order because of the buildup of material over the top of them for millions of years. Hence, the oldest will be on the bottom. This can be altered by certain geoligical processes and will depend on the rockbed and formation present in the area.
Was Africa the first continent that people appeared on?
That is correct. The fossil record shows that human fossils appear in Africa long before they appear anywhere else.
What is the difference between trace fossil and index fossil?
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.
What is a break in geologic record?
a break in the geological record is a disconformity
