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The Cambrian Period
During this epoch, a variety of marine life-forms appeared during this period.The shallow seas covered most of the continents during this period. Invertebrates flourished during this time. -
Period: to
D Torres Period 4
Geological Timescale -
The Ordovician Period
During this period, a number of trilobite species began to shrink. The Dominant life-form during this time were Brachiopods, Bryozoans, and cephalopod mollusks. Also, vertebrates appeared and there was very little plant life. -
The Silurian Period
During this period, eurypterids existed and vascular land plants as well as animals evolved on land. -
The Devonian Period
This period was known as "the age of fishes" because fossils of fish were discovered and early anphibians resembled huge salamanders are known to be ancestors of modern anphibians. Also, seed bearing plants began to develop. -
The Carboniferous Period
During this period, it was really warm, there was high humidity and forests and swamps covered most of the land. Giant cockroaches were common and also large lizards. -
The Permian Period
During this period, a mass extintion of life-forms occured and Pangea has began to form. The Appalachian mountains were developed. -
The Triassic Period
During this time, dinasours flourished, the first mammals and small rodent-like forest dwellers also appeared. -
The Jurassic Period
During this period, dinasours became the dominant life-form and flying reptiles were common. -
The Cretaceous- Tertiary Mass Extintion
No dinasour fossils were found during this period. Scientists believe the extintion was caused by climate change, volcanic eruptions and the continental drifts. Plant life began to die and Earth became cooler. -
Tertiary Period
This was the time before the last ice age. -
Quaternary Period
Began with the last ice age and includes the present. -
Paleocene Epoch
Many new mammals, such as rodents evolved. The first primates began to flourish. -
Eocene Epoch
Horses, whales, flying squirrels, and bats appeared and small reptiles continued to flourish. -
The Oligocene Epoch
The Indian Subcontinent began to collide with the Eurasian subcontinent. The climate was cooler and drier and large species of deer, pigs, horses, camels, cats, and dogs appeared. -
Miocene Epoch
The modern Antartic icecap began to form and tectonic forces caused the Mediteranian sea to dry up and refill. The largest mammals existed during this epoch. -
The Pliocene Epoch
Predators, including memebrs of the bear, dog, and cat families evolved. The first modern horses appeared and climatic changes and the continental ice sheets began to spread. -
The Pleistocene Epoch
This Epoch began 1.8 MYA. woolly mammoths survived because of their fur and fossils of the earliest humans were discovered and they may have been hunters. -
The Holocene Epoch
This Epoch began 11,500 years ago and early humans developed agriculture and began to make and use tools of bronze and iron.
