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The Paleozoic Era, which ran from about 542 million years ago to 251 million years ago, was a time of great change on Earth.
The Paleozoic began with the Cambrian Period, 53 million years best known for ushering in an explosion of life on Earth. After the Ordovician Period came the Silurian Period (443 million years ago to 416 million years ago), which saw the spread of jawless fish throughout the seas. This was the time when plants evolved, though they most likely did not yet have leaves or the vascular tissue that allows modern plants to siphon up water and nutrients. As the tetrapods took over, they had company: The Devonian Period saw the rise of the first land-living arthropods, including the earliest ancestors of spiders. The last period of the Paleozoic was the Permian Period, which began 299 million years ago and wrapped up 251 million years ago. All this evolution took place against the backdrop of shifting continents and a changing climate.
The Cambrian was warm worldwide, but would be followed by an ice age in the Ordovician, which caused glaciers to form, sending sea levels downward. In the Devonian, the northern land masses continued merging, and they finally joined together into the supercontinent Euramerica.


Shop Windows to the Universe Science Store!The Fall 2010 issue of The Earth Scientist, focuses on rocks and minerals, including articles on minerals and mining, the use of minerals in society, and rare earth minerals, and includes 3 posters! The Cambrian peroiod of the Paleozoic Era spanned from 542 million years ago to 488 million years ago. After the Cambrian Period came the 45-million-year Ordovician Period, which is marked in the fossil record by an abundance of marine invertebrates. Mollusks and corals also thrived in the oceans, but the big news was what was happening on land: the first undisputed evidence of terrestrial life. Those developments would appear in the Devonian Period, the next geological period of the Paleozoic.
Gondwana moved further south during the Ordovician, while the smaller continents started to move closer together. She covers the world of human and animal behavior, as well as paleontology and other science topics. The Website was developed in part with the support of UCAR and NCAR, where it resided from 2000 - 2010.
Long before birds evolved, tetrapods began laying eggs on land for the first time during this period, allowing them to break away from an amphibious lifestyle.


They had been joined as one supercontinent, Rodinia, but during the Cambrian Period, Rodinia fragmented into Gondwana (consisting of what would eventually become the modern continents of the Southern Hemisphere) and smaller continents made up of bits and pieces of the land that would eventually make up today's northern continents. In the Silurian Period, the land masses that would become North America, central and northern Europe, and western Europe moved even closer together.
By the last period of the Paleozoic, the Permian, Euramerica and Gondwana became one, forming perhaps the most famous supercontinent of them all: Pangaea. Stephanie has a Bachelor of Arts in psychology from the University of South Carolina and a graduate certificate in science communication from the University of California, Santa Cruz.
Terrestrial vertebrates evolved to become herbivores, taking advantage of the new plant life that had colonized the land. There are many different types of minerals, each with a different name and a special set of characteristics.



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