Michigan Geologic Time Line List
Michigan Geologic Time Line List
Michigan Geologic Time Line List
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<strong>Michigan</strong> <strong>Geologic</strong> <strong>Time</strong> <strong>Line</strong> <strong>List</strong><strong>Michigan</strong> Rocks: www.educ.msu.edu/michiganrocksStudentNameNo. Event Age <strong>Geologic</strong> <strong>Time</strong>Division1. Modern Humans .01 (10,000 Holoceneyears)2. Ice Age Begins; Glaciers 2 million years Pleistocenecover all of <strong>Michigan</strong>; GreatLakes carved out byGlaciersago3. First Humans 4.5 million Plioceneyears ago4. First Horses 40 million years Eoceneago5. Last Dinosaurs 65 million yearsagoCretaceous/TertiaryBoundary6. First Flowering Plants 100 million Cretaceousyears ago7. First Birds 150 million Jurassic8. Redbeds (reddishsandstones and shales)deposited at the end of the<strong>Michigan</strong> Basinyears ago145 millionyears ago9. First Mammals 215 millionyears ago10. First Conifer Trees 230 millionyears ago11. First Dinosaurs 240 millionyears ago12. Last Trilobites 250 millionyears ago13. Swampland in Lower 290 millionPeninsula and eastern years agoUpper Peninsula, <strong>Michigan</strong>Basin. Peat deposits. Alsooil and gas deposits14. First Reptiles 300 millionyears ago15. Gypsum and Limestone 320 milliondeposited in shallow seas in years agoLower Peninsula andeastern Upper Peninsula –<strong>Michigan</strong> Basin16. First Sharks 350 millionyears agoJurassicTriassicTriassicTriassicPermian/TriassicBoundaryPennsylvanianPennsylvanianMississippianDevonian
StudentNameNo. Event Age <strong>Geologic</strong><strong>Time</strong>Division17. Hexagonaria coral deposits(becomes MI state fossil akaPetosky Stone) in <strong>Michigan</strong>Basin360 million yearsago18. First Amphibians 370 million yearsago19. First Insects 400 million yearsago20. First Land Plants 420 million yearsago21. Salt deposited in shallow seas 430 million yearsin southern <strong>Michigan</strong> inago<strong>Michigan</strong> Basin22. First Fish 480 million yearsago23. Sandstones of the Pictures 500 million yearsRocks National Lakeshore agodeposited in shallow seas;Beginning of the <strong>Michigan</strong> Basin24. First Trilobites 550 million yearsago25. First abundant fossils 600 million yearsago26. Mountains as big as the Rocky 1.0 billion yearsMountains in western Upper agoPeninsula27. Oldest known fossil (algae) iniron deposits probably similarto black smokers in oceanstoday28. Volcanoes, basalt flows, pillowlavas (lavas erupted in oceanwater)29. Metamorphic rocks of theCanadian Shield, oldest rocks in<strong>Michigan</strong>, exposed in Western2.1 billion yearsago2.8 billion yearsago3.5 billion yearsagoUP30. Earth Formed 4.6 billion yearsagoDevonianDevonianDevonianOrdovicianOrdovicianOrdovicianCambrianCambrianPrecambrianProterozoicArcheanArcheanArcheanHadean
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