Thursday, July 29, 2010

Step by Step (3)

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Note: It is recommended to begin with the post titled "Bringing the Pieces Together" (July 28) below. Continuing the analysis: ...

Step by Step (2)

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Continuing the analysis. I had presented the idea that: "Concurrently, during the Cretaceous, some of the flying dromaeosaurids and ...
2 comments:

Step by Step (1)

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In the earlier post I had presented the idea that: "By the early Cretaceous, some pterosaurs (by the process of cladogenesis) , had dev...
1 comment:
Wednesday, July 28, 2010

Bringing the Pieces Together

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Above is a time-based cladogram (Chiappe 2009) covering maniraptors. It shows accurately the actual fossil evidence but unfortunately int...
Tuesday, July 27, 2010

Stratocladistics - The breakfast of champions

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http://www.sciencemag.org/cgi/content/abstract/284/5421/1816?ijkey=ae5e228a882495f5bc344f9ed7439c817a13dfe2&keytype2=tf_ipsecsha Recon...
Monday, July 26, 2010

Another time-based cladogram

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Here is another time-based cladogram. This one is of maniraptors. The predominance of the dromaeosaurids, troodontids and enantiornithes is ...
Friday, July 23, 2010

* The Fossil Record

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We have seen that the dino-to-bird based cladograms are not congruent with the fossil record. The dino-to-bird enthusiasts say that is beca...
3 comments:

Frances James Study

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For those who wish to learn more about the dinosaur to bird hypothesis, and other archosaur (but not pterosaur) candidates, I heartily recom...
Thursday, July 22, 2010

* Analyzing the Studies

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In the previous post, I mentioned that the Wills et al (2008) analysis did not include any cladogram that included both dinosaurs and birds....
Wednesday, July 21, 2010

Digging into the GER details

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MSM and GER calculations are a powerful and objective way to determine the level of fit between any proposed cladogram and the fossil record...
6 comments:
Tuesday, July 20, 2010

More on Incongruence

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Let's look at other studies: http://en.wikipedia.org/wiki/Temporal_paradox_(paleontology) "Third, if the temporal paradox would i...
Thursday, July 15, 2010

Another time-based cladogram

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Here is another time-based cladogram (Hu et al 2009) that was done after the Wills et al study of 2008, that I presented in the previous pos...
Wednesday, July 14, 2010

* Comparing dinosaur cladograms to the fossil record

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Here is a totally fascinating report on how the published dinosaur cladograms compare to the stratigraphic (time) record. It is significant...
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Tuesday, July 13, 2010

Stratocladistics

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A way to incorporate time into the calculations, is through the technique of "stratocladistics" (rather than "cladistics...

Cladistics and Time (2)

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In the previous post I quoted an article that made the point: "The cladistic analysis of the Boreaspidids may simply not be as accurat...

Cladistics and Time (1)

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http://www.kheper.net/evolution/systematics/cladistics.htm "One of the big weaknesses of the cladistic system is it's disregard o...
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Thursday, July 8, 2010

* Mahakala

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Here is the typical, up-side-down, thinking of the dino-to-bird enthusiasts, using cladistic analysis. http://en.wikipedia.org/wiki/Mahak...
2 comments:

Flying first, then secondarily flightless afterward

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http://www.dinosaur-museum.org/featheredinosaurs/Are_Birds_Really_Dinosaurs.pdf With the benefit of hindsight it is easy to see that if...
Sunday, July 4, 2010

Into the Details (2)

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Continuing the discussion. Let's look more closely at the flying birds (Eumaniraptors/Paraves) and the flightless maniraptor birds (e...
Friday, July 2, 2010

Into the Details (1)

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In an earlier post I had said: It is important to realize that the result of cladistic analysis (ie. the comparison of characteristics ) ...