Posts Tagged "Fossil" by Jrw0517
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Amber, beautiful amber...
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2 yrs 11 mos ago
In Florida and other 'tropical climates' most folks have seen the common lizards that scoot around bush to bush. These Anoles have been around a long time. At least 20 million years. Here is one in the amber. Look closely, the amber specimen contains that head of a lizard. Not only does this piece have the head, but it also has the bones of the forelegsThere is still some tissue on it. You can even see the metacarpals. I can't tell you how rare this is. It just doesn't happen very often!!!
For all my fossil lovin' friends! |
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Dragonfly fossil
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3 yrs 1 mo ago
Insect Order Odonata comprise the Dragonflies (suborder anisotera) and damselflies (suborder zygoptera), and like cockroaches is one of the oldest types of insects. They appeared in the Devonian during the Paleozoic, a time when their distant cousins, the trilobites, were still abundant. This ancient, fixed-wing design apparently is a good one, given that there are some 5500 extant species known of Odonata.
(for lexidiem) |
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Feathered dino fossil
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3 yrs 1 mo ago
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Fern fossil
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3 yrs 1 mo ago
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Amber
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3 yrs 1 mo ago
Fossil amber (or fossil resin or resinite) results from the polymerization (cross-linking of organic compounds with hydrogen bonds) of tree resin. The first resin producing trees were the fern trees that appeared in Devonian time when the first insects also appeared. The oldest insect inclusions occur in Cretaceous (dinosaur-age) amber. Over millions of years the efficiency of natural selection tinkered with tree resin and its production in various ways to evolve protective mechanisms. For example, resin is used to seal wounds, provide a protective barrier to insects and infection, and as a medium of delivery for chemicals the tree produces to combat insects. By the Cenozoic Era, trees were well adapted in their various uses of resin for defense. Polymerization that is temperature-sensitive occurs very rapidly in resins, with further polymerization slowing dramatically over time. Thus, the age of amber varies from the Holocene to the Cretaceous, though the older,
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Dino egg
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3 yrs 1 mo ago
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