The Fossils of Illinois a Brief Guide to the More Common Fossils in the Rocks O
The Fossils of Illinois a Brief Guide to the More Common Fossils in the Rocks O
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In our eReader you can find the full English version of the book. Read The Fossils of Illinois a Brief Guide to the More Common Fossils in the Rocks O Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Fossils of Illinois a Brief Guide to the More Common Fossils in the Rocks O
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It is much more probable that plants and animals did not leave much of a record before the Cambrian because they were not equipped with hard parts. A hard shell or bony skeleton or woody tissue is almost a necessity if a fossil is to be preserved; an organism lacking such a structure is likely to be eaten or to decay before its body can be buried in sediment. We note that many of the earliest Cambrian fossils have small and imperfectly developed shells, indicating that at that time they were ju...st l)eginning to develop such structures. As to the second point, we observe that almost all of the major groups of animals and plants are represented in Cambrian rocks, either at the beginning or before the end of the period. The others, not known from Cambrian rocks, appear shortly after and in such highly developed form that they too probably lived in the Cambrian but escaped preservation. All of the animals and plants of the Cambrian that we know are marine forms. The two most abundant groups of animals in the Cambrian are the trilobites and the brachiopods.
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To quickly assess the difficulty of the text, read a short excerpt:
It is much more probable that plants and animals did not leave much of a record before the Cambrian because they were not equipped with hard parts. A hard shell or bony skeleton or woody tissue is almost a necessity if a fossil is to be preserved; an organism lacking such a structure is likely to be eaten or to decay before its body can be buried in sediment. We note that many of the earliest Cambrian fossils have small and imperfectly developed shells, indicating that at that time they were ju...st l)eginning to develop such structures. As to the second point, we observe that almost all of the major groups of animals and plants are represented in Cambrian rocks, either at the beginning or before the end of the period. The others, not known from Cambrian rocks, appear shortly after and in such highly developed form that they too probably lived in the Cambrian but escaped preservation. All of the animals and plants of the Cambrian that we know are marine forms. The two most abundant groups of animals in the Cambrian are the trilobites and the brachiopods.
What to read after The Fossils of Illinois a Brief Guide to the More Common Fossils in the Rocks O?
You can find similar books in the "Read Also" column, or choose other free books by Carlton Condit to read onlineMoreLess
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