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Silurian period – Fish get jaws

By |2018-04-19T11:29:11+00:00June 25th, 2017|Biology, Geology|

Silurian period: Trout swimming When was the Silurian period? The beginning of the Silurian period was about 443 million years ago. Some environmental problem at the end of the Ordovician period (probably ice ages) killed most of the plants and animals on Earth. The creatures that survived this extinction were the ones that [...]

Quaternary period – modern times

By |2018-11-09T07:50:38+00:00June 24th, 2017|Biology, Geology|

The Quaternary Period includes today - big cities and all When was the Quaternary Period? The Quaternary period began about 1.8 million years ago (1,800,000 years ago), coming after the Tertiary. The Quaternary is still going on today - we live in the Quaternary period. So far, it's a much shorter period than [...]

Permian period – Reptiles and pine trees

By |2018-04-21T11:56:38+00:00June 24th, 2017|Biology, Geology|

Crocodiles About 290 million years ago, the Carboniferous period ended and the Permian period began. Almost all of the land on Earth grouped together in one big supercontinent we call Pangaea, which reached all the way from the North Pole to the South Pole. With all the land grouped together, the climate got [...]

Devonian Period – Gondwana, ferns, lungfish

By |2018-04-21T11:56:37+00:00June 24th, 2017|Biology, Geology|

Coelocanth Four hundred and sixteen million years ago, when the Silurian period ended and the Devonian period began, most of the land on Earth was clumped together into a supercontinent called Gondwana. At this time the only creatures that lived on land were small plants like moss and lichens, mushrooms, and other fungi, [...]

What happened in the Cambrian Period?

By |2018-04-21T11:56:36+00:00June 23rd, 2017|Geology|

Mossy rocks At the beginning of the Cambrian Period, about 542 million years ago, there were sea creatures like hydras, jellyfish, sponges and seaweed living in the oceans, but only one-celled algae on land yet. Small arthropods like beetles were beginning to appear, and by 540 million years ago the first land plants [...]