The Encyclopedia Americana, Količine 1–30Bernard S. Cayne Grolier, 1981 |
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Stran 143
... Silurian periods consist mainly of limestone , sandstones , and shales laid down in salt water . Although they yield many invertebrate animal fossils , plant re- mains are scarce . However , there is ample evi- dence that algae were ...
... Silurian periods consist mainly of limestone , sandstones , and shales laid down in salt water . Although they yield many invertebrate animal fossils , plant re- mains are scarce . However , there is ample evi- dence that algae were ...
Stran 191
... Silurian , in which case the restricted Silurian is referred to as Gotlandian . The Silurian is dominated by invertebrate types similar to those of the Ordo- vician , but considerably more advanced . Corals attain a greater diversity ...
... Silurian , in which case the restricted Silurian is referred to as Gotlandian . The Silurian is dominated by invertebrate types similar to those of the Ordo- vician , but considerably more advanced . Corals attain a greater diversity ...
Stran 192
... Silurian limestones . In North America particularly the Upper Silurian is marked by arid conditions , with deposits of salt and gypsum . Closely associated with these beds are the waterlimes , which have furnished the largest eurypterid ...
... Silurian limestones . In North America particularly the Upper Silurian is marked by arid conditions , with deposits of salt and gypsum . Closely associated with these beds are the waterlimes , which have furnished the largest eurypterid ...
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