The earliest era is the Cryptic era (an informal designation) for the earliest part of the Hadean eon which is not technically seperated into era. The first formal era is the Eoarchaean.
Era
Cenozoic
fossil record geologic time scale
The age of dinosaurs is called the mezoic. this consists of three eras-the creatous, jurrasic and the
The Cambrian Explosion, around 542 million years ago.
an era is a very long span of geologic time
No, a geologic era is a longer unit of time than a geologic period. Geologic eras are divided into periods, which are further subdivided into epochs. The hierarchy from largest to smallest is era, period, epoch.
In geologic time, the Hadean is the first EONof Earth's history, from it's formation 4.57 billion years ago to about 4 billion years ago. The Hadean is not an era, which is a smaller subdivision of geologic time.
Era
The first era in geologic time is the Precambrian era, spanning from about 4.6 billion years ago to 541 million years ago. It is characterized by the formation of the Earth, the origin of life, and the development of early single-celled organisms. This era laid the foundation for the subsequent evolution of more complex life forms.
After an era, the next smallest division of time would be an epoch. An epoch is equal to around 10,000,000 years, where as an era is 100,000,000 years.
A period is smaller than an era in the geologic time scale. It is further subdivided into epochs and ages.
The 3 eras of geologic time is Palezozoic era, Mesozoic era, and Cecozoic era
Penguins first appeared during the Paleocene epoch, which is part of the Cenozoic era in the geologic time scale. This period lasted from about 66 to 56 million years ago.
Precambrian Era.
precambrian times
Eon.