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542 Million years ago to 248 Million years ago. This is known for the development of visible fossils. It includes the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, which includes the Mississippian and Pennsylvanian periods, and the Permian. It ended with the Permian extinction, in which most kinds of life were wiped out. |
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542-490 Million years ago. Most major groups of animals begin to appear in the fossil record.
490-443 Million years ago. Abundant marine fossils. most land lay in southern continent of Gondwana. Possibly ended with an ice age which caused a mass extinction in marine life.
443-417 Million years ago. Vascular plants existed on land. coral reefs developed. Arthropods appeared. Fishes, including jawless and first jawed fishes developed.
417-354 Million years ago. Land plants included horsetails, earliest seed plants, wingless arthropods and insects, many types of fish.
354-290 Million years ago. Extensive swamps with tree ferns, Amniote egg developed among tetrapods.
290-248 Million years ago. First gymnosperms.
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History including prehistory, antiquity, classical and medieval history, modern history, and the future can be connected. |
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This is connected somewhat to physics, chemistry, astronomy, and earth science. It is also connected to molecular biology, organism biology, systematics, ecology, and other periods of biohistory. Other areas of knowledge such as Personal studies, anthropology, culture, institutions, and sociology will be connected as this site develops. |
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