0
What else can I help you with?
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 are the 12 main periods in the four main eras of earths past?
Cenozoic * Recent (Holocene) * Pleistocene * Pliocene * Miocene * Oligocene * Eocene * Paleocene Mesozoic Mesozoic * Cretaceous * Jurassic * Triassic Paleozoic * Permian * Carboniferous (Pennsylvanian Mississippian) * Devonian * Silurian * Ordovician * Cambrian Pre-Cambrian You can remember this using the following mnemonic (starting at the bottom) Camels ordinarily sit down carefully perhaps their joints creek probably early oiling will prevent permanent rheumatism. For a more detailed view of this look in the related link below.
Is it correct that life evolved in the Cambrian and humans evolved in Africa?
While it is certainly true that life diversified significantly during the Cambrian, it did not originate in the Cambrian, but roughly three billion years before that. And yes, the first populations of anatomically modern humans are thought to have emerged in Africa.
Why is it important to scientists that many organisms during the Cambrian period had hard parts?
Referred to the Cambrian explosion is the Cambrian period. Shells and exoskeletons had hard parts. The Cambrian period was the first of the Paleozoic Era.The hard parts made the preservation of their shapes, and sometimes their body cavities, much more easy to recognize as a fossil. The earlier soft bodied organisms required very fine silts for their effective preservation. A representative group they found are the Ediacaran fauna.
Why did the Ediacara fauna thrive during the Cambrian Period even though they were immobile?
They didn't thrive in the Cambrian, they are very rare and not necessarily the same biologically as the forms in the Precambrian. Soft bodied preservation in the Ediacaran style occurs throughout the Phanerozoic, but becomes increasingly rare after the Cambrian- perhaps due to disturbance of bedding surfaces by metazoans, but there are many other possibilities.
What period came after the Cambrian period?
The Ordovician period came after the Cambrian period.
What was before Triassic Period?
Carboniferous Silurian Ordovician Devonian Cambrian Pre Cambrian
The Ordovician period follows the extinction at the end of which period?
The Ordovician period follows the extinction at the end of the Cambrian period.
What are the periods that divide the early paleozoic?
Devonian, Carboniferous and Permian Periods
How did the Cambrian period end?
The Cambrian period ended around 485 million years ago with an event known as the Cambrian-Ordovician extinction. This extinction event is believed to have been caused by changes in the Earth's climate and sea levels, as well as volcanic activity. It resulted in the loss of many marine species, paving the way for the rise of new organisms during the subsequent Ordovician period.
Why were there no plants during the Cambrian time era?
There were simple plants in the Cambrian Period(542 - 488.3Ma). Fossil algae has been found in Cambrian Rocks. Evidence of primitive algae from the Precambrian Super-Eon has also been found but exact classification has not been established. It is true that embryophytes (Plants we most recognise) did not evolve until the Ordovician Period(488.3 - 443.7Ma).
What are the time periods of the paleozoic era?
From youngest to oldest: 1. Permian 2. Pennsylvanian 3. Mississippian 4. Devonian 5. Silurian 6. Ordovician 7. Cambrian
What has the author Norbert Everett Cygan written?
Norbert Everett Cygan has written: 'Cambrian and Ordovician conodonts from the Big Horn Mountains, Wyoming' -- subject(s): Paleontology, Conodonts
What has the author Maxine Yvonne Huselbee written?
Maxine Yvonne Huselbee has written: 'Late Cambrian to earliest Ordovician (Ibexian) conodont evolution and biogeography of Greenland and northwest Scotland'
What 2 letters come next in this pattern d d p v c c d?
P N Cambrian, Ordovician, Silurian etc. etc. etc.
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 has the author Virgil B Cole written?
Virgil B. Cole has written: 'Subsurface Ordovician-Cambrian rocks in Kansas' -- subject(s): Geology, Stratigraphic, Oil fields, Stratigraphic Geology
