Can I fish for red drum in a lake?
What about the fact that the "simple" organisms are buried in the lower levels and the more "complicated" ones are buried in the higher levels? Doesn't this fact support the notion that simple organisms evolved into more and more complex organisms over time, with the more complex organisms buried and fossilized above the earlier and simpler life forms?
Certainly this seems like a very logical assumption. But, things just aren't that easy. There are a number of potential problems with this interpretation of the fossil record.
For example, it is interesting to note that some general kinds of fossilized creatures are very generally found in the same relative vertical orientation, with respect to each other in the fossil record, that they would have naturally been found in during life.
Single celled organisms make their first appearance in the lowest layers followed by multicelled ocean bottom-dwelling creatures like sponges and worms etc. Higher up come creatures like bony fishes, then land plants and animals, then birds and larger land animals. Of course, this is a very general pattern and does not explain why certain creatures that lived on the bottoms of oceans, like trilobites, make their first appearance in the Cambrian Ma while other creatures that live on ocean bottoms, like crabs and lobsters, don't appear until the beginning of the Cretaceous Ma.
If the geologic column truly represents a series of closely spaced catastrophic burial events instead of long ages of time, how can this feature be explained?
Certainly this seems like a difficult and rather mysterious problem for those, like myself, who might think to question the long age notion of the fossil record.
At least a partial explanation might be found in the fairly recently discovered fact that at least some nested hierarchical patterns to the distribution of different populations both living and within the fossil record seem to be strongly related to ecological and population-size factors.
This pattern arises when species that appear on few islands occur only on the islands with the most species, while only the most widespread species are found on the islands with few species Wright et al.
The nested subset pattern arises because species differ in their distributions across space. Some species use a wider range of resources or persist across a wider range of habitats than others Brown, ; Brown et al.
Generally, species that use a wide range of resources or tolerate a variety of abiotic conditions can establish more populations in more places than comparable species with relatively narrow niches Brown, ; Cook and Quinn, Differences in the ability of species to distribute themselves across space have distinct consequences for the structure of communities.
Sites that encompass a greater area tend to have more species Rosenzweig, This is because large areas include a subset of species not found elsewhere.
Therefore, the nested subset pattern of species distribution in space is thought to reflect the gradient in abundance among species Gaston, ; Leitner and Rosenzweig, ; Maurer, This hypothesis is at least plausible given the author's conclusion that, "Species identities and their relative abundances are non-random properties of communities that persist over long periods of ecological time and across geographic space.
This is consistent with species abundance contributing heavily to evolutionary patterns. For example, coelacanth fish exist in the fossil record for what are thought to have been million years.The standard approach to looking at fossils in the geological column is to assume that lower is older.
Since the geologic column represents millions of years of Earth's history, then obviously the fossils in each of the layers must be the same age as the layer in which they are found. What is especially interesting is that the fossils do appear to show a progression from the most "simple" of.
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Today Krabs is four months old and he is still thriving I don't reccomend purchasing crabs from here as Krabs was the only crab healthy a pet store is more convent Now here are /5(9). Download-Theses Mercredi 10 juin We seem to have established a nascent tradition here on regardbouddhiste.com around fifth Wednesdays, and I’m by no means distressed by that.
The first month with five Wednesdays since the new blog launched, which was this last August, I decided on the spur of the moment to . English vocabulary word lists and various games, puzzles and quizzes to help you study them.