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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 of time were abundant and were wide spread geographically?
Trilobites are an example of remains from a species that existed for relatively short periods of time, were abundant, and were geographically widespread. Trilobites lived from the Early Cambrian to the Late Permian period, spanning over 270 million years, and were diverse and numerous in marine environments worldwide. Their fossils are commonly found in rocks around the world.
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.
Which are the remains of species that existed on earth for relatively short periods and were abundant and widespread geographically?
Fossils of index fossils, which are species that lived for short periods and were widespread geographically, are commonly used in stratigraphy to date and correlate rock layers. These species are useful markers because they can be found in multiple locations and help determine the age of the rock layers they are found in.
What is an extinct arthropod abundant during the Paleozoic's era?
One notable extinct arthropod from the Paleozoic era is the trilobite. These marine creatures were diverse and abundant, with a wide range of sizes and forms, thriving in the oceans from the Cambrian to the Permian periods. Trilobites are characterized by their three-lobed body structure and are often used as index fossils for dating and correlating the age of rock layers. Their extinction occurred around 252 million years ago during the Permian-Triassic extinction event.
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
Is when most fossils were probably formed?
Most fossils were likely formed during the Paleozoic Era, which lasted from about 541 to 252 million years ago, particularly in the Cambrian and Ordovician periods when diverse marine life was abundant. However, significant fossilization also occurred during the Mesozoic Era, known for the age of dinosaurs, and in the Cenozoic Era, which includes the rise of mammals. Fossilization typically requires specific conditions, such as rapid burial and low oxygen environments, making it more likely in sedimentary rock formations.
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.
What are the remains of species that existed on Earth for relatively short periods of time were abundant and were wide-spread geographically?
The remains of species that existed for relatively short periods of time, were abundant, and widely distributed geographically are referred to as "index fossils." These fossils are valuable for dating and correlating the age of rock layers, as their presence indicates specific geological time frames. Common examples include trilobites and ammonites, which help geologists and paleontologists understand the chronological sequence of Earth's history.
What order are triassic Jurassic Cambrian devonian?
From oldest to youngest: Cambrian, Devonian, Triassic, Jurassic.
