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During which period in the geologic time scale was there a great increase in the variety of life forms on earth?
The Cambrian Period, approximately 541 million years ago, is known as the "Cambrian Explosion" because of the rapid diversification and increase in the variety of life forms on Earth during that time. This period saw the emergence of most major groups of animals that exist today.
What geologic period did humans evolve?
Homo sapiens first emerged during the Quaternary period, some time between 130,000 and 450,000 years ago; but the first members of the Homo genus (Homo habilis) are believed to have emerged around 2.4 Ma ago. Yup! :D
What is a trassic period?
The Triassic Period is a geological time period that occurred from about 251 to 201 million years ago. It followed the Permian Period and preceded the Jurassic Period in the Mesozoic Era. The Triassic Period saw the diversification of early reptiles and the rise of dinosaurs.
According to scientists mammals made their first appearance during what period of the Mesozoic era?
Mammals made their first appearance during the Mesozoic era in the Triassic period. This period lasted from about 252 million years ago to 201 million years ago. Mammals evolved from their synapsid reptile ancestors during this time.
How long ago did the Cambrian explosion happen?
The Cambrian explosion occurred about 541 million years ago. It marked a period of rapid diversification of life forms, with the sudden appearance of a wide variety of complex multicellular organisms in the fossil record.
Which came first the Jurassic or Triassic period of geologic time?
The Triassic period came before the Jurassic period in geologic time. The Triassic period lasted from around 251 million to 201 million years ago, followed by the Jurassic period, which lasted from around 201 million to 145 million years ago.
What was the geologic time period of ordovican?
The Ordovican period was in the Paleozoic era, and occurred between 488.3 million years ago and 443.7 million years ago.
In what geologic period did the raptor live?
The Velociraptor lived in the late Cretaceous Period, about 75-70 million years ago.
Which period represents the last 2 million years of geologic time?
The last 2 million years of geologic time is represented by the Quaternary period. It is characterized by repeated glaciations and interglacial periods, shaping the Earth's surface as we know it today.
What period represents the last 2 million years of geologic time?
The last 2 million years of geologic time is part of the Quaternary Period, which is characterized by major advances and retreats of continental ice sheets, as well as the evolution and dispersal of humans.
What's the vendian period?
The Vendian Period, also known as the Ediacaran Period, was the final geologic period of the Neoproterozoic Era before the Cambrian Period. It lasted from about 635 million to 541 million years ago and is known for the appearance of complex multicellular life forms, including the earliest known animals.
How long ago did the most important period of geologic building take place in California?
between about 160 million and 100 million years ago
Precambrian are fossils yes or no?
Precambrian is a geologic period that extends as back as 4.500 million years ago. Fossils are very rare from that period of time.
Which period in the geologic time scale did the penguins first live in?
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.
In which geologic period were apatosaurus found in?
Apatosaurus lived between 154 and 150 million years ago. This was during the Kimmeridgian and Tithonian stages of the Jurassic period.
What was the name of the Geologic time period that the T-rex lived in?
They all lived during the Cretaceous period.
What geologic ages were Athyris alive?
Athyris was a genus of brachiopods that existed during the Carboniferous Period, specifically in the Mississippian and Pennsylvanian epochs. This places Athyris in the geologic ages of the Carboniferous Period, which lasted from approximately 359 to 299 million years ago.
