3. Geologic Time Scale
PRECAMBRIAN HADEAN Cryptic (4570 â 4150)
īFormation of Moon (4533 Ma)
īOldest known mineral, Zircon
(4406 Âą 8 Ma) [Metamorphosed
sandstone conglomerate of Jack
Hills, Western Australia]
4. Geologic Time Scale
PRECAMBRIAN HADEAN Basin Group (4150 â 3920)
īOldest known rock (4030 Ma)
[The oldest known rock on Earth is
found along the northeast coast of
Hudson Bay, Canada.]
īFirst lifeforms, RNA (4000 Ma)
īNapier Orogeny in Antarctica
(4000 Âą 200 Ma)
5. Geologic Time Scale
PRECAMBRIAN HADEAN Basin Group (4150 â 3920)
īOldest known rock (4030 Ma)
[The oldest known rock on Earth is
found along the northeast coast of
Hudson Bay, Canada.]
īFirst lifeforms, RNA (4000 Ma)
īNapier Orogeny in Antarctica
(4000 Âą 200 Ma)
6. Geologic Time Scale
PRECAMBRIAN HADEAN Nectarian (3920 â 3850)
īFormation of Nectaris Basin and other major lunar basins by large
impact events.
7. Geologic Time Scale
PRECAMBRIAN HADEAN Early Imbrian (3850 â 3800)
īEnd of the Late Heavy Bombardment of the inner solar system.
8. Geologic Time Scale
PRECAMBRIAN HADEAN Early Imbrian (3850 â 3800)
īIndirect photosynthetic evidence (e.g., kerogen) of primordial life
9. Geologic Time Scale
PRECAMBRIAN ARCHEAN Eoarchean (3800 â 3600)
īSimple single celled life (probably bacteria and perhaps archaea)
10. Geologic Time Scale
PRECAMBRIAN ARCHEAN Paleoarchean (3600 â 3200)
īFirst known oxygen-producing bacteria
īOldest cratons on the earth (Canadian Shield & Pilbera Craton)
īRayner Orogeny in Antarctica
11. Geologic Time Scale
PRECAMBRIAN ARCHEAN Paleoarchean (3600 â 3200)
īFirst known oxygen-producing bacteria
īOldest cratons on the earth (Canadian Shield & Pilbera Craton)
īRayner Orogeny in Antarctica
12. Geologic Time Scale
PRECAMBRIAN ARCHEAN Paleoarchean (3600 â 3200)
īFirst known oxygen-producing bacteria
īOldest cratons on the earth (Canadian Shield & Pilbera Craton)
īRayner Orogeny in Antarctica
13. Geologic Time Scale
PRECAMBRIAN ARCHEAN Mesoarchean (3200 â 2800)
īFirst stromatolites (colonial cyanobacteria)
īHumboldt Orogeny in Antarctica, Blake River Megacaldera Complex
begins to form (present Ontario & Quebec)
14. Geologic Time Scale
PRECAMBRIAN ARCHEAN Mesoarchean (3200 â 2800)
īFirst stromatolites (colonial cyanobacteria)
īHumboldt Orogeny in Antarctica, Blake River Megacaldera Complex
begins to form (present Ontario & Quebec)
15. Geologic Time Scale
PRECAMBRIAN ARCHEAN Mesoarchean (3200 â 2800)
īFirst stromatolites (colonial cyanobacteria)
īHumboldt Orogeny in Antarctica, Blake River Megacaldera Complex
begins to form (present Ontario & Quebec)
16. Geologic Time Scale
PRECAMBRIAN ARCHEAN Neoarchean (2800 â 2500)
īMantle overturn event
īAbitibi greenstone belt (present Ontario & Quebec)
17. Geologic Time Scale
PRECAMBRIAN ARCHEAN Neoarchean (2800 â 2500)
īMantle overturn event
īAbitibi greenstone belt (present Ontario & Quebec)
24. Geologic Time Scale
PRECAMBRIAN PROTEROZOIC Paleoproterozoic
Orosirian (2050 â 1800)
īOxygenic atmosphere
īVredford & Sudbury Basin asteroids impacts
īGlenburgh (Capricorn) Orogeny in Australia
25. Geologic Time Scale
PRECAMBRIAN PROTEROZOIC Paleoproterozoic
Orosirian (2050 â 1800)
īOxygenic atmosphere
īVredford & Sudbury Basin asteroids impacts
īGlenburgh Orogeny in Australia
īKimban Orogeny in South Africa
īRuker Orogeny in Antarctica
26. Geologic Time Scale
PRECAMBRIAN PROTEROZOIC Paleoproterozoic
Statherian (1800 â 1600)
īFirst complex single celled life: protists with nuclei
īMangaroon Orogeny in Western Australia
īKararan Orogeny in South Australia
27. Geologic Time Scale
PRECAMBRIAN PROTEROZOIC Mesoproterozoic
Calymmian (1600 â 1400)
īBarramundi Orogeny, MacArthur Basin, Northern Australia
īIsan Orogeny, Mount Isa Block, Queensland
28. Geologic Time Scale
PRECAMBRIAN PROTEROZOIC Mesoproterozoic
Ectasian (1400 â 1200)
īGreen algae in seas
īGrenville Orogeny in North America
29. Geologic Time Scale
PRECAMBRIAN PROTEROZOIC Mesoproterozoic
Stenian (1200 â 1000)
īFormation of Rudinia
īMusgrave Orogeny,
Musgrave Block, Central
Australia
30. Geologic Time Scale
PRECAMBRIAN PROTEROZOIC Neooproterozoic
Tonian (1000 â 850)
īRodinia Supercontinent persists.
īTrace Fossils of multi celled eukaryotes
31. Geologic Time Scale
PRECAMBRIAN PROTEROZOIC Neooproterozoic
Tonian (1000 â 850)
īBeginning of
Adelaide
Geosyncline in
Australia
37. Geologic Time Scale
PRECAMBRIAN PROTEROZOIC Neooproterozoic
Ediacaran (630 â 542)
īEdiacaran biota flourish
worldwide in seas
īSimple trace fossils of
worm-like Trichophysus,
etc.
38. Geologic Time Scale
PRECAMBRIAN PROTEROZOIC Neooproterozoic
Ediacaran (630 â 542)
īFirst sponges and trilobitomorphs
īSoft-jellied creatures shaped like bags, discs, or quilts (like Dickinsonia)
43. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Cambrian (542
â 488.3)
īMany Ediacaran fauna die out
īProkaryotes, protists & fungi continue to present day
īGondwana emerges
īAtmospheric CO2 content roughly 20-35 times present-day
44. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Ordovician
(488.3 â 443.7)
īInvertebrates diversify into many types long straight-shelled
cephalopods. Early corals, articulate brachiopods, bivalves, ostracods,
many types of echinoderms (crinoids, cystoids, starfish, etc.) branched
graptolites, and other taxa all common.
45. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Ordovician
(488.3 â 443.7)
īInvertebrates diversify into many types long straight-shelled
cephalopods. Early corals, articulate brachiopods, bivalves, ostracods,
many types of echinoderms (crinoids, cystoids, starfish, etc.) branched
graptolites, and other taxa all common.
46. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Ordovician
(488.3 â 443.7)
īCondents appear
īFirst green plants and fungi on land
īIce age at end of period
47. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Silurian (443.7
â 416.0)
īFirst vascular plants, first millipedes and arthropleurids on land
īFirst jawed fishes, armoured jawless fish populate the seas.
48. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Silurian (443.7
â 416.0)
īSea-scorpians reach large size
īBeginning of Caledonian Orogeny, and the Scandinavian Mountains
49. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Silurian (443.7
â 416.0)
īBeginning of Caledonian Orogeny
50. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Silurian (443.7
â 416.0)
īBeginning of
Scandinavian
Mountains
51. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Silurian (443.7
â 416.0)
īBeginning of
Caledonian Orogeny,
and the Scandinavian
Mountains
52. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Devonian (416
â 359.2)
īFirst clubmosses, horsetails and
ferns appear
53. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Devonian (416
â 359.2)
īFirst seed-bearing plants, first
trees and first insects
īEarly sharks, jawed fishes and
lobe-finned fishes rule the sea
54. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Devonian (416
â 359.2)
īFirst amphibions still aquatic
īOld Red Continent of
Euroamerica
55. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Devonian (416
â 359.2)
īAcadian Orogeny for
Anti-atlas Mountains of
North Africa and
Applachian Mountains
of North America
56. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Mississippian
(359.2 â 318.1)
īLarge primitive trees
īFirst land vertebrates
and amphibious sea-
scorpians
57. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Mississippian
(359.2 â 318.1)
īLobe-finned Rhizodonts dominant water
predators
īEarly sharks common in oceans
īCorals, bryozoa, goniatites and
brachiopods very common
īTrilobites and nautiloids decline
īGlaciation in East Gonwana
58. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic
Pennsylvanian (318.1 â 299)
īWinged insects radiate suddenly
īAmphians common and diverse
īFirst reptiles and coal forests
īHighest ever atmospheric oxygen levels
60. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Permian (299 â
251)
īLandmasses unite into supercontinent Pangea
īEnd of Permo-Carboniferous
62. Geologic Time Scale
CAMBRIAN PHANEROZOIC Paleozoic Permian (299 â
251)
īBeetles and flies
evolve
īPermian-Triassic
event occur on 251
Ma, 95% life on earth
become extinct
īAltaid Orogeny in Asia
64. Geologic Time Scale
CAMBRIAN PHANEROZOIC Mesozoic Triassic (251 â
199.6)
īArchosaurs dominant on land as dinosaurs,
and as Ichthyosaurs and nothosaurs in
oceans, and in air as pterosaurs
īFirst mammels Crocodilia appear
66. Geologic Time Scale
CAMBRIAN PHANEROZOIC Mesozoic Jurrasic (199.6
â 145.5)
īGymnosperms & ferns common
īMany types of dinosaurs such as sauropods,
carnosaurs and stegosuars
īMammels common but small
īFirst birds and lizards
īSea urchins very common alongwith starfish
and sponges
īCO2 levels 4-5 times the present-day level.
67.
68. Geologic Time Scale
CAMBRIAN PHANEROZOIC Mesozoic Jurrasic (199.6
â 145.5)
īBreakup of Pangea into Gondwanaland & Laurasia
69. Geologic Time Scale
CAMBRIAN PHANEROZOIC Mesozoic Cretaceous
(145.5 â 65.5)
īFlowering plants with new types of insects.
īMany new types of dinosaurs like Tyrannosaurs, Titanosaurs, duck bills
and horned dinosaurs
īModern sharks
īBreakup of Gondwana
īAtmospheric CO2 close to present-day
70. Geologic Time Scale
CAMBRIAN PHANEROZOIC Cenozoic Paleogene
Paleocene (65.5 â 55.8)
īTropical climate
īModern plants appear
īExtinction of dinosaurs
īFirst large mammels
(up to bear or small
hippo size)
īAlpine Orogeny in
Europe & Asia
īIndian Subcontinent
collides with Asia (55
Ma)
īHimalayan Orogeny
71. Geologic Time Scale
CAMBRIAN PHANEROZOIC Cenozoic Paleogene
Eocene (55.8 â 33.9)
īCooling climate
īPrimitive whales
īFirst grasses
īReglaciation of Antarctica and formation of its ice age
72. Geologic Time Scale
CAMBRIAN PHANEROZOIC Cenozoic Paleogene
Oligocene (33.9 â 23.03)
īWarm but cooling climate moving towards Icehouse
īRapid evolution and diversification of fauna, especially mammels
īMajor evolution and dispersal of flowering plants
73. Geologic Time Scale
CAMBRIAN PHANEROZOIC Cenozoic Neogene
Miocene (23.03 â 5.332)
īModerate Icehouse climate
īModern mammels & bird families
īHorses and mastodons diverse
īKaikoura Orogeny, Carpathean orogeny, Hellenic orogeny begins and
continuous today
74. Geologic Time Scale
CAMBRIAN PHANEROZOIC Cenozoic Neogene
Pliocene (5.332 â 2.588)
īIntensification of present Icehouse conditions,
īPresent ice age begins roughly 2.58 Ma; cool and dry climate
īMany of the existing genera of mammels and recent mollusks
īHomo habilis appear
75. Geologic Time Scale
CAMBRIAN PHANEROZOIC Cenozoic Quaternary
Pleistocene (2.588 â 0.01143)
īFlourishing and then extinction of many large mammels
īEvolution of anatomically modern humans
īQuaternary Ice Age continues with glaciations
īFurther intensification of Icehouse conditions, roughly 1.6 Ma
īLast glacial period (18000 â 15000)
76. Geologic Time Scale
CAMBRIAN PHANEROZOIC Cenozoic Quaternary
Holocene (0.01143 â recent)
īLast glacial period ends
īRise of human civilization
īSahara forms from savannah
īAgriculture begins
īStone age begin around 10000 BC, giving away to Copper age (3500
BC) and Bronze Age (2500 BC).
īCultural growth and technical advancement through the Iron Age
(1200 BC), giving rise to Classical antiquity such as Roman Empire and
even to the Middle Ages and present day