Examples of geological times in zoology

1. The Cambrian Explosion: This period, which occurred around 541 million years ago, marked a rapid diversification of animal life on Earth. Many major animal groups, including arthropods, mollusks, and chordates, first appeared during this time.

2. The Mesozoic Era: This era, which lasted from around 252 to 66 million years ago, is often referred to as the "Age of Dinosaurs." It was a time of great diversity and evolution in the animal kingdom, with dinosaurs dominating the land and marine reptiles ruling the seas.

3. The Pleistocene Epoch: This epoch, which lasted from around 2.6 million to 11,700 years ago, was marked by a series of ice ages and the evolution of many iconic megafauna species, such as mammoths, saber-toothed cats, and giant ground sloths.

4. The Holocene Epoch: This epoch, which began around 11,700 years ago and continues to the present day, has seen the rise of modern animal species, including humans. It is characterized by significant changes in the Earth's climate and ecosystems, as well as the ongoing impact of human activities on the environment.

- Paleozoic Era: This era lasted from about 541 million years ago to about 252 million years ago. It is divided into six periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian. During this era, the first animals evolved, including the first vertebrates.
- Mesozoic Era: This era lasted from about 252 million years ago to about 66 million years ago. It is divided into three periods: the Triassic, Jurassic, and Cretaceous. During this era, the dinosaurs evolved and dominated the Earth.
- Cenozoic Era: This era began about 66 million years ago and continues to the present. It is divided into three periods: the Paleogene, Neogene, and Quaternary. During this era, the mammals evolved and became the dominant land animals.

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