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Ordovician Period – limestone and liverwort

By | 2017-12-07T09:03:15+00:00 June 24th, 2017|Geology|

The Ordovician period saw the evolution of the octopus At the end of the Cambrian period, about 488 million years ago, most of the plants and animals living on Earth died, because of some catastrophe that we don't know much about. This catastrophe marks the beginning of the Ordovician period. Limestone formed Sea [...]

Spiders and their Webs – Biology

By | 2017-09-16T18:40:57+00:00 May 25th, 2017|Biology|

Fossil spider from the Cretaceous era Spiders evolved from annelid worms beginning about 540 million years ago. They were among the first land creatures with more than one cell. At about the same time, the first bigger land animals began to come out of the water: frogs and salamanders. These ate spiders. The earliest evidence of an orb [...]