Phanerozoic Eon

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Phanerozoic - The Phanerozoic (occasionally Phaenerozoic) Eon is the period of geologic time during which abundant animal life has existed. It covers roughly 545 million years and goes back to the time when diverse hard-shelled animals first appeared.

Precambrian - The Precambrian is an informal name for the eons of the geologic timescale that came before the current Phanerozoic eon. It spans from the formation of Earth around 4500 Ma (million years ago) to the evolution of abundant macroscopic hard-shelled fossils, which marked the beginning of the Cambrian, the first period of the first era of the Phanerozoic eon, some ...

Bashkirian - In the geologic timescale, the Bashkirian is the age of the Pennsylvanian epoch of the Carboniferous period of the Paleozoic era of the Phanerozoic eon that is comprehended between 318 million 100 thousand and 311 million 700 thousand years ago, approximatedly. The Bashkirian age succeeds the Serpukhovian age of the Mississippian epoch of the same period and precedes the Moscovian age of the Pennsylvanian epoch.

Bajocian - In the geologic timescale, the Bajocian is the final geologic age of the Middle Jurassic epoch of the Jurassic period of the Mesozoic era of the Phanerozoic eon that is comprehended between 171 million 600 thousand and 167 million 700 thousand years ago, approximately. The Bajocian age succeeds the Aalenian age and precedes the Bathonian age, all in the same epoch.

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Layer of the Earth Atmosphere - ... the temperature of the underlying surface. Earth's atmosphere - [of Atmosphere (NOAA)] layeroftheearthatmosphere The division of these two eons is the study of climate change taken on the scale of the Cambrian The earth's history dates back more than 4.5 billion years (Ga) which is divided roughly into 2 eons called the "cryptozoic" [Gr. Some influential researchers, including Briton Simon Conway Morris, an expert in the Burgess ...

Picture of the Atmosphere Layer - ... earth's history dates back more than 4.5 billion years (Ga) which is divided roughly into 2 eons called the "cryptozoic" [Gr. Originally it was thought that life began with the Cambrian. Some influential researchers, including ... earth's history dates back more than 4.5 billion years (Ga) which is divided roughly into 2 eons called the "cryptozoic" [Gr. Originally it was thought that life began with the Cambrian. Some influential researchers, ...

Precambrian Era - ... from the Precambrian, Paleozoic, Mesozoic, and Cenozoic eras. Original. Precambrian - The Precambrian is an informal name for the eons of the geologic timescale that came before the current Phanerozoic eon. It spans from the formation of Earth around 4500 Ma (million years ago) to the evolution ...

Precambrian Era - ... from the Precambrian, Paleozoic, Mesozoic, and Cenozoic eras. Original. Precambrian - The Precambrian is an informal name for the eons of the geologic timescale that came before the current Phanerozoic eon. It spans from the formation of Earth around 4500 Ma (million years ago) to the evolution ...

Era Precambrian - ... from the Precambrian, Paleozoic, Mesozoic, and Cenozoic eras. Original. Precambrian - The Precambrian is an informal name for the eons of the geologic timescale that came before the current Phanerozoic eon. It spans from the formation of Earth around 4500 Ma (million years ago) to the evolution ...

Precambrian Era - ... from the Precambrian, Paleozoic, Mesozoic, and Cenozoic eras. Original. Precambrian - The Precambrian is an informal name for the eons of the geologic timescale that came before the current Phanerozoic eon. It spans from the formation of Earth around 4500 Ma (million years ago) to the evolution ...

Paleozoic Era - ... geology) - A geologic era is a subdivision of geologic time that is a separate classification that divides the Phanerozoic Eon into three parts timeframes. The the Paleozoic, the Mesozoic, and the Cenozoic represent the major stages in ...

Mesozoic Era - ... value and dinosaurs that behave very strangely. Mesozoic - The Mesozoic is one of three geologic eras of the Phanerozoic eon. The division of time into eras dates back to Giovanni Arduino in the 18th century, although his ...