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Why are animal fossils more abundant from the Cambrian Period than from the earlier periods?
Wiki User
∙ 11y ago
Because Paleozoic era rock is much older than Mesozoic era rock, these strata are generally at greater depth than Mesozoic rock, thus limiting their accessibility to areas that have been exposed by weathering and erosion.
Wiki User
∙ 15y ago
Wiki User
∙ 11y agobecause of the Cambrian explosion, suddenly we have more species hitting the scenes, and thus, abundance of fossils.
Wiki User
∙ 10y agoAnimal fossils are more plentiful than plant fossils because animals contain hard parts such as bones, teeth, and shells.
Wiki User
∙ 10y agoThere are usually more fossils from the Cenozoic era because the fossils are embedded in rock layers that are close to the Earth's surface.
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Do all organisms become fossils?
No. The hard bones are more likely to form a fossil. The soft parts will degenerate over time. This is why most of the fossils from the Pre-Cambrian and Cambrian periods are mostly shells, not the actual animals that inhabited them.
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.
What are the major subdivisions of geologic times?
The major subdivisions are the Precambrian, Palaeozoic, Mesozoic and Cenozoic, which are subdivided into Archean and Proterozoic (Precambrian), Cambrian, Ordovician, Silurian, Devonian, Carboniferous (or Missisipian and Pennsylvanian in the US) and Permian (Palaeozoic), Triassic, Jurassic and Cretaceous (Mesozoic) and Tertiary and Quaternary (Cenozoic). For a graphical representation, see http://geomaps.wr.usgs.gov/socal/geology/geologic_history/images/geologic_time_scale.jpg
What is the best evidence that many different geologic periods are represented in Virginia?
The presence of fossils of different ages
Why do archaeologists compare human bones and fossils from different time periods?
To learn about the past.
What is the difference between the Cambrian and preCambrian periods?
The difference between The differeence between the Cambrian and Pre-Cambrian is that the Cambrian fossils are ones of hard shell creatures because of thee evolved predators. The difference between Cambrian and Pre-Cambrian is that the Cambrian fossils are ones of hard shell creatures because of the evolved predators.rian fossils Cambrian and Pre-Cambrian is that the Cambrian fossils are ones of hard shell creatures because of the evolved predators.
Which are the remains of species that existed on earth for relatively short periods and were abundant and widespread geographically?
It is index fossils.
Which are the remains of species that existed on Earth for relatively short periods of time were abundant and were wide spread geographically?
They are called index fossils, an aid to relative dating of rock.
What is the significance of the didvision between the Cambrian and PreCambrian periods?
During the Cambrian period, life began to appear on the planet.
What is the importance of index fossils?
Index fossils are the fossils of short-lived species which, because of their short lives, can be used by scientists to identify the age of the rock strata in which they're found. (For example, if you know a certain species only lived in the Cambrian period, and you find some fossils of this species in some rock, then you know the other fossils you find in that rock must also have come from the Cambrian period.) Some examples of species that left behind index fossils, and their related historical periods, are:Billingsella corrugagta - Cambrian period, Palaeozoic eraCactocrinus multibrachiatus - Mississippian period, Palaeozoic eraScaphites hippocrepia - Cretaceous period, Mesozoic eraNeptunea tabulata - Quarternary period, Cenozoic eraSee the links below for more examples and info.
do Eras and periods both appear at the start of the Cambrian period?
farts
What are the periods that divide the early paleozoic?
Devonian, Carboniferous and Permian Periods
Do all organisms become fossils?
No. The hard bones are more likely to form a fossil. The soft parts will degenerate over time. This is why most of the fossils from the Pre-Cambrian and Cambrian periods are mostly shells, not the actual animals that inhabited them.
How paleontologists use trilobite use fossils as index fossils for various geologic time periods?
yeah
During what period did the first vertebrates appear?
The first vertebrates evolved during the Cambrian Explosion about 525 million years ago. The Cambrian Explosion, obviously, occurred during the Cambrian period. The Cambrian period was part of the Paleozoic era.
What were some of the periods included in the paleozoic era?
The periods are... 1. Cambrian 2. Ordovician 3. Silurian 4. Devonian 5. Carboniferous 6. Permian -You owe me big time!
What are the geologic periods named from?
Most geologic periods are named for the location where rock formations were first found that contained fossils from that period, some others (e.g. Carboniferous) were named for materials associated with the fossils.
