Geologic Timescale

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Geologic Timescale

Hydronian Period (Week 0)

4,000 Million Years Long / 0-4000 my

Huggian Period (Week 1)

100 Million Years Long / 4000-4100 my


In the first week, the Ur-organism "Protosagania" evolved into different species via adaptive radiation. During this period, the different kingdoms formed and spread over the globe. Near the end of the period, some highly-evolved organisms originated. At the end of this week, a solar flare wiped out the most of the organisms. This era lasted approx. 100 million years.

Ovian Period (Week 2)

100 Million Years Long / 4100-4200 my


The second week lasted as long as the first one. During this period, primitive plants adapted to the land followed by primitive animals and a group of lifeforms which are both animals and plants. In the seas, fish-like animals evolved. On land, the first animal laying hard-shelled eggs appeared. At the end of this era, a giant ice meteor hit the planet, causing a mass extinction and a rise in sea level.

Krakowian Period (Week 3)

50 Million Years Long / 4200-4250 my


The third week lasted approx. 50 million years. While some fish-like animals adapted to live on land, complex food chains developed there as well. While animals had been either herbivores or omnivores in the Ovian Period, now real carnivores appeared. Along with that, a new group of animals from the deep sea adapted to live on the surface of the water.

Yoktonian Period (Week 4)

50 Million Years Long / 4250-4300 my


The fourth week lasted approx. 50 million years. This period features the first large creature. On land, forests started to form, raising the variety of species.

Rhodixian Period (Week 5)

50 Million Years Long / 4300-4350 my


The fifth week lasted approx. 50 million years long. In this era, all the landmasses form one single continent similar to Pangaea. The most notable event in this period was the appearance of a small simple plant which grows very fast and covers nearly everything. Because it spread over the whole planet, it highly influenced the evolution of the other organisms. Another very interesting species was a tree whose seeds were flammable and had to burn to reproduce.

Flischian Period (Week 6)

25 Million Years Long / 4350-4375 my


The sixth week lasted 25 million years long. The life on the planet began to specialize. During this era, the first organism living only in the air appeared, and many of the organisms evolved symbiosis or parasitism.

Irinyan Period (Week 7)

25 Million Years Long / 4375-4400 my


The seventh week lasted approx. 25 million years. A new group of organisms, the so-called Crystal Shrubs -part plant, part fungus-, discovered the land. Also, the ecosystem in the atmosphere extended and the polar regions became inhabited. In this period the largest organism of all times evolved: a crystal shrub which can grow up to a kilometer high.

Ladymian Period (Week 8)

12.5 Million Years Long / 4400-4412.5 my


The eighth week lasted approx. 12.5 million years. Now the single landmass split into two continents named Glicker and Wright. The fresh water bodies became filled with life, and the huge crystal shrubs formed whole ecosystems. A special generation featured nothing but microorganisms, which had been disregarded as background species in the earlier weeks.

Russian Period (Week 9)

12.5 Million Years Long / 4412.5-4425 my


The ninth week lasted approx. 12.5 million years. The different continents Glicker and Wright featured different kinds of organisms and habitats. The most interesting lifeform from this period was an animal that uses its tongue as a parachute.

Nukean Period (Week 10)

12.5 Million Years Long / 4425-4437.5 my


The tenth week lasted approx. 12.5 million years. While the crystal shrubs evolved into many different species, a plague wiped out some of the predators on the eastern continent. Another virus killed all of the flora in the eastern reef. The most interesting species in this era was a plant made of small cubes, which can move independently inside the plant, allowing the plant to change into different shapes.

Biocatian Period (Week 11)

12.5 Million Years Long / 4437.5-4450 my


The eleventh week lasted approx. 12.5 million years. For the first time this week, two related species evolved into a single species by interbreeding. There was also another special generation containing nothing but microorganisms. The most interesting species from this era was a worm-like animal which uses its wings to collect sunlight, much like a plant.

Ferretian Period (Week 12)

12.5 Million Years Long / 4450-4462.5 my


The twelfth week lasted approx. 12.5 million years.

Clayrenian Period (Week 13)

12.5 Million Years Long / 4462.5-4475 my


The thirteenth week lasted approx. 12.5 million years.

Allenian Period (Week 14)

12.5 Million Years Long / 4475-4483.5 my


The fourteenth week lasted approx. 12.5 million years.

Martykian Period (Week 15)

12.5 Million Years Long / 4483.5-4500 my


The fifteenth week lasted approx. 12.5 million years. During this period, a sapient species, the nomad, evolved. After 100 generations, a gamma ray from a supernova annihilated a majority of the wildlife. Only the hardiest and most endurable survived.

Rabidian Period (Week 16)

12.5 Million Years Long / 4500-4512.5 my


The sixteenth week lasted approx. 12.5 million years.

Kingon Period (Week 17)

12.5 Million Years Long / 4512.5-4525 my


The seventeenth week lasted approx. 12.5 million years.

Somanian Period (Week 18)

12.5 Million Years Long / 4525-4537.5 my


The eighteenth week lasted approx. 12.5 million years.

Raptorian Period (Week 19)

12.5 Million Years Long / 4537.5-4550 my


The nineteenth week lasted approx. 12.5 million years. At the very beginning of the Raptorian period, an ice comet struck in Jujubee Ocean, triggering a mass extinction and raising sea levels.

Biglian Period (Week 20)

12.5 Million Years Long / 4550-4562.5 my


The twentieth week lasted approx. 12.5 million years. In this period, the continents began to break apart further, with Glicker splitting into Darwin and Drake and Wright splitting into Dixon and Barlowe.

Yannickian Period (Week 21)

12.5 Million Years Long / 4562.5-4575 my


The twenty-first week lasted approx. 12.5 million years. It marked the beginning of an ice age. In this period the largest organism of all time evolved: an iron flora known as the Orbit Voltflora which could grow to be 2 kilometers long.

Bloodian Period (Week 22)

12.5 Million Years Long / 4575-4587.5 my


The twenty-second week lasted approx. 12.5 million years. During this period, the ice age would reach it's climax, having been triggered by a supervolcanic event. Known as the snowball event, this rapid cooling of the world resulted in one of the worst mass extinctions in Sagan 4 history. Life from Sagan 4 also arrived on Mason at the beginning of the period through panspermia.

Masonian Period (Week 23)

12.5 Million Years Long / 4587.5-4600 my


The twenty-third week lasted approx. 12.5 million years. At the beginning of this period, a solar flare struck Sagan 4 and Mason, thawing their glaciers and causing a mass extinction event.

Darthian Period (Week 24)

12.5 Million Years Long / 4600-4612.5 my


The twenty-fourth week lasted approx. 12.5 million years. It marks the end of the ice age. Mason's oceans were also evaporated by solar wind, causing the rings of Sagan 4 to form. This week saw a radiation of small terrestrial herbivores, as well as the reemergence of truly gigantic organisms in the oceans.

Blargian Period (Week 25)

12.5 Million Years Long / 4612.5-4625 my


The twenty-fifth week lasted approx. 12.5 million years. Mason lost its atmosphere, wiping out all life on its surface. Water from the rings of Sagan 4 rained down on the planet and caused sea levels to rise, wiping out many island ecosystems.

Bonoian Period (Week 26)

12.5 Million Years Long / 4625-4637.5 my


The twenty-sixth week lasted approx. 12.5 million years. A supercontinent was formed consisting of Dixon, Darwin, and Vivus. The last of the ice from the rings of Sagan 4 rained down, wiping out a few more islands. Sagan 4's biosphere also finally returned to the same level of biodiversity it had prior to the snowball event.

Huckian Period (Week 27)

12.5 Million Years Long / 4637.5-4650 my


The twenty-seventh week lasted approx. 12.5 million years. The continent of Drake moved north and began forming glaciers, and increased geological activity resulted in the re-expansion of the lowlands and the emergence of numerous island chains.