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Wordswarms From Years Past


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Adjacent Words

Silphium terebinthaceum
Silt
silt up
siltation
Silted
Silting
siltstone
silty
Silundum
Silure
Silures
Silurian
silurid
silurid fish
Siluridae
Siluridan
siluriform fish
Siluriformes
Siluroid
Siluroidei
Silurus
Silurus glanis
silva
Silva, da
Silvae

Silurian period definitions

WordNet (r) 3.0 (2005)

n
1: from 425 million to 405 million years ago; first air- breathing animals [syn: Silurian, Silurian period]

Britannica Concise

Interval of geologic time, 438-408 million years ago; the third period of the Paleozoic era. The Silurian follows the Ordovician period and precedes the Devonian. It marks the first appearance of land plants and jawed fishes. The continents were distributed as follows: Arctic Canada, Scandinavia, and Australia were probably in the tropics; Japan and the Philippines may have been inside the Arctic Circle; S. America and Africa were likely near the S. Pole, with either present-day Brazil or W Africa as the locus of the pole. The land surface was buried by an ice sheet, possibly as deep as that covering Antarctica today.



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