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What is the importance of fossils that are consistently found in the same geologic time period?
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What geologic period has fossils of the most primitive lifeforms?
cambrian
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.
Which of the following is most accurate in helping pinpoint a time period on the geologic time scale during which a rock layer was formed?
index fossils
Is A geologic era is a shorter unit of time than a geologic period?
n
Was era or period longer?
On the geologic time scale, an era is longer than a period. There are 12 geologic eras in total and they are composed of geologic periods. For instance, the Mesozoic era is composed of the Triassic, Jurassic and Cretaceous periods.
What geologic period has fossils of the most primitive lifeforms?
cambrian
What geologic period has fossils that closley resemble organisms living today?
Tirtiary
Precambrian are fossils yes or no?
Precambrian is a geologic period that extends as back as 4.500 million years ago. Fossils are very rare from that period of 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.
What is sunderlands formation?
The Sunderland River Formation is a geologic formation in Nunavut. It preserves fossils dating back to the Devonian period.
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.
Which of the following is most accurate in helping pinpoint a time period on the geologic time scale during which a rock layer was formed?
index fossils
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.
When did large numbers of fossils first appear in the geologic record?
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.
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 did Lyell's description of the principle of uniformitarianism help Darwin understand his geologic observations?
Darwin recognized that he evidence of ancient changes he was seeing were probably similar to Earth changes he was witnessing during his time period. Layers of silt covered marine fossils, earthquakes caused changes in the geologic formations, and volcanoes covered land formations and fossils.
