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... strides, and the ammonoids (a group of now- extinct cephalopods) emerged,
evolving from their continuing nautiloid ancestors. Corals and similar animals
were abundant, and reef habitats for other invertebrates became widespread.
Elephant seals feed on fish and on squid or other cephalopods. The northern
species is nonmigratory; the southern elephant seal, like the northern form,
breeds and molts on land, but it winters at sea, possibly near the pack ice. During
It is characterized by strata in several subdivisions, or zones, that include
ammonoid cephalopods. The presence of these fossilif- erous zones permits far-
ranging stratigraphic correlations to be made. Rocks of the Famennian Stage
have a ...
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LibraryThing ReviewUser Review - keylawk - www.librarything.com
This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review
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For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review