Scientists and geologists know the importance of an accurate timeline. Minerals and precious stones such as those found in silver jewelry need an accurate date attached to them, which is only done with an accurate timeline. The time scale is equally important in regards to dating fossils and determining when they were created. 

Phanerozoic Eon (544 million years ago to present)
The Phanerozoic Eon: discusses general information on the era and information on the different time periods within the era.

Cenozoic Era (65 million years ago to present)
Introduction to Cenozic: examines the different divisions of the era, with information on each one.

Quaternary Period (1.8 million years ago to present)
 Quaternary Period: gives a time-line and information on the animals and plant life during the era.

Holocene Epoch (8,000 years ago to present)
The Holocene Epoch: explains what happened during the epoch and examines different evidence of the era.

Pleistocene Epoch (1.8 million to 8,000 years ago)
Pleistocene Epoch: offers different resources on the era such as when it began and when it ended.

Tertiary Period (65 to 1.8 million years ago)
Tertiary Period: focuses on the dinosaurs and life found during the Tertiary Period.

Pliocene Epoch (5.3 to 1.8 million years ago)
Pliocene Epoch: gives an informative look at the epoch including the time period and animal life.

Miocene Epoch (23.8 to 5.3 million years ago)
Miocene Epoch: examines the different eras found within the epoch including the Messinian era.

Oligocene Epoch (33.7 to 23.8 million years ago)
Oligocene Epoch: offers information on animal life and geology of the era.

Eocene Epoch (55.5 to 33.7 million years ago)
The Eocene: describes the major occurrences during the era such as shifting of land boundaries.

Paleocene Epoch (65 to 55.5 million years ago)
Paleocene Epoch: discusses geological occurrences and animal life in the time period.

Mesozoic Era (248 to 65 million years ago)
The Mesozoic Era: focuses on climate and geological changes as well as the animals living during the era.

Cretaceous Period (145 to 65 million years ago)
The Cretaceous Period: examines the animal life, climate and geology of the cretaceous period.

Jurassic Period (213 to 145 million years ago)
Dinosaur Facts: gives facts on the different dinosaurs commonly found during the Jurassic period.

Triassic Period (248 to 213 million years ago)
Triassic Period: focuses on the climate and geology of the era.

Paleozoic Era (544 to 248 million years ago)
The Paleozoic Era: in depth look at how the world changed during this time period.

Permian Period (286 to 248 million years ago)
Permian: offers examples of fossils found from this period.

Carboniferous Period (360 to 286 million years ago)
Carboniferous Period: explains how the period differs in different countries and continents.

Pennsylvanian Period (325 to 286 million years ago)
Pennsylvanian Period: examines the geology and makeup of the period in the United States.

Mississippian Period (360 to 325 million years ago)
Mississippian Period: focuses on the geology of the period including rocks and fossils.

Devonian Period (410 to 360 million years ago)
The Devonian Period: offers examples of fossils found that date back to this period.

Silurian Period (440 to 410 million years ago)

Silurian Period: examines fossils from this period found in parts of Kentucky.

Ordovician Period (505 to 440 million years ago)
Ordovician Period: provides information on different topics including geology and animal life.

Cambrian Period (544 to 505 million years ago)
What was the Cambrian Period?: gives a short description of the period and the major events from the time.

Precambrian Time (4500 to 544 million years ago)
Precambrian Time: examines the era and fossils found from the era.

Proterozoic Era (2500 to 544 million years ago)
Proterozoic Era: focuses on the geology and animals of the era.

Vendian Period (544 to 650 million years ago)
Age of Animals: primarily focuses on the dinosaurs and animals living during the period.

Archean Era (3800 to 2500 million years ago)
Archean: gives an exact definition and description of the era.

Hadean Time (4500 to 3800 million years ago)
Hadean Time: offers a short definition of the period.

When fossils are uncovered, workers need to determine the date. This helps determine when different animals roamed the earth and when plants were common. This helps scientists and geologists present an accurate picture of what the world once looked like.