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- I am a fish from the Silurian time period. I was born 443.8 million years ago... So technically I'm not alive. But I still want to take you through my life cycle, with the help of one of my buddies.
- Our time period started, when continental landmasses were low and sea levels were rising. This meant rich shallow sea ecosystems with new ecological niches.
- Wait really? I didn't know that... is that why we can see the top of the ocean?
- Yes! And due to the warmer weather, the arrival of the first plants began to colonize the land. Bryophytes like moss, hornworts and liverworts. Air breathing creatures like Millipedes, centipedes and the earliest arachnids first appear in the Silurian
- I don't know what any of those things are...
- That explains why we are here!
- You don't seem to know anything about our history...Not only did we get new plants and animals, the Earth’s atmosphere developed an effective ozone layer concentration, which caused the rising sea levels, but on top of that, the Silurian time period was the evolution and diversification of fish
- Yes! You are correct! Those are some of the many animals we have living in our time period! You are starting to catch on.
- That 's why we have fish like trilobites, graptolites, conodonts, corals, stromatoporoids, and mollusks.
- But unfortunately, our time period end when 85% of all species on Earth went extinct in the Ordovician-Silurian extinction. Our extinction was a most likely a result of global cooling and reduced sea levels, which dramatically impacted the many marine species living in warm, shallow coastal waters. But I hope you learned something about how we came about and I hope you enjoyed my story.
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