extinction

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25 06, 2017

Silurian period – Fish get jaws

By |2018-04-19T11:29:11-07:00June 25th, 2017|Biology, Geology|0 Comments

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 [...]

24 06, 2017

Quaternary period – modern times

By |2018-11-09T07:50:38-07:00June 24th, 2017|Biology, Geology|0 Comments

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 [...]

24 06, 2017

Permian period – Reptiles and pine trees

By |2019-09-20T12:28:14-07:00June 24th, 2017|Geology|0 Comments

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 [...]

24 06, 2017

Devonian Period – fish, lungfish

By |2019-09-20T12:26:23-07:00June 24th, 2017|Biology, Geology|0 Comments

Coelocanth: a fish from the Devonian period When was the Devonian period? 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. Silurian period Plate tectonics All our geology articles Life in [...]

23 06, 2017

What happened in the Cambrian Period?

By |2019-02-26T21:09:50-07:00June 23rd, 2017|Geology|0 Comments

Mossy rocks The Cambrian gets started 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. Proterozoic Era More geological eras All our geology articles First plants and animals on [...]