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General Information

History
Prehistory
Distant Past
Paleoindian
Archaic
Woodland
Gravel Pit
Wetland
Plant Survey
Planting Plants
Watershed
Recent History
2002
2003
 

Location
Photo Tour
Flora
Fauna
NPS Pollution Control
Other Resources
Contact Us

Geologic Time

 

Era Period Start Time Notes
Cenozoic Quarternary 2 million years ago Ice Age, modern humans
Tertiary 66 million years ago abundant mammals
Mesozoic Cretaceous 144 million years ago first flowering plants; extinction of dinosaurs
Jurassic 208 million years ago first birds; abundant dinosaurs
Triassic 257 million years ago first dinosaurs and mammals; conifer forests
Paleozoic Permian 297 million years ago extinction of trilobytes and other marine animals
Pennsylvanian 323 million years ago first reptiles; fern forests; abundant insects
Mississippian 360 million years ago large primative trees
Devonian 415 million years ago first amphibians; fish diversify
Silurian 438 million years ago early plants and animals on land
Ordovician 490 million years ago jawless armored fish
Cambrian 543 million years ago first abundant shelly invertibrates
Precambrian Proterozoic 2500 million years ago one-cell organisms (bacteria, protists)
Archean 4600 million years ago oldest fossils; origin of the Earth

 

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Last updated Monday, November 17, 2003 7:00.