Catastrophes open the next geological era, shown by color.
Belts
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Mercury
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Venus
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Earth
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Moon
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Mars
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Kuiper Belt planet explodes; initiates Late Heavy Bombardment (LHB)
3.9 - 3.2 billion atomic years ago. |
LHB forms first and major population of craters. The "inter-crater plains" formed soon after as molten rock filled the great craters. |
It is expected that the LHB left impact structures on Venus. These were obliterated by later events. |
LHB impacts form cratons (the stable shield areas of the continents) Process ends in Archean Period, about 5400 BC |
LHB forms the Lunar Maria and highland craters. |
LHB and associated impacts form the Northern lowland basins |
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Proterozoic Period |
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Asteroid Planet Mantle (rocky) explodes.
800-700 million atomic years ago |
Produces giant Caloris Basin and other structures. Magma overflow forms "smooth plains" filling lowland areas in the north. |
Impactors probably cause pressurized sub-crustal water to erupt, yielding large ocean |
MAPCIS Impact (Australia). Interior water erupts, resulting in "Snowball Earth" strata/ Noah's Flood.
about 3550 BC |
Crater Copernicus forms, along with other craters. |
Hellas and Argyre impacts cause pressurized sub-crustal waters to erupt, yielding large ocean in northern lowlands. |
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Paleozoic Era |
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Asteroid Planet core (nickel-iron) explodes
255-250 million atomic years ago |
Another series of impacts gives a population of craters on top of the "smooth plains." |
Massive magma outpouring vaporizes ocean and re-surfaces entire planet. Atmosphere is now high in CO2 and sulfuric acid, with high deuterium content from water. |
Wilkes Land Crater in Antarctic; antipodal outpouring of Siberian Traps. Volcanism; Permian Extinction/ Tower of Babel
about 3300 BC.
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Another series of impacts resulting in another layer of craters. |
Impacts release pressure from interior molten rocks. Magma eruption floods norhern plains and vaporizes ocean. Eruptions yield high CO2 atmosphere. |
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Mezozoic Era |
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Asteroid Moon (carbonaceous) explodes
70-65 million atomic years ago |
Final series of impacts forms a population of small craters over the whole planet. |
Impacts form large and small craters evenly distributed over the surface of the planet. |
Yucatan and 7 other large impacts cause K/T extinction/ begins continental division -- time of Peleg and Job
about 3050 BC |
Crater Tycho forms along with other smaller craters, fairly evenly distributed. |
Final series of impacts on Martian surface result in a poulation of smaller craters |
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Cenozoic Era |
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