[TigerLikesRooster]

One more piece of the puzzle, called "The Extinction of Dinosaurs by Asteriod Impact."

[gorebegone]

I think it was something else being spewed out that caused the climate to warm.

[spetznaz]

I watched a documentary on the Shoemaker-Levy-9 impact on Jupiter that occured in 1994 (I believe it was 1994), and it was really interesting. They said that the energy expended was equivalent to a Hiroshima-sized detonation, every second, for 13 years. And that the dust could caused by the impacts were greater than the size of the Earth.

Now, if the dust cloud can be that large, then it can be assumed that a huge meteorite hit (not necessarily something as big as the ShoemakerLevy9 comet that impacted Jupiter) could be counted on raising a sizeable dust cloud that would change life as we know it.

In the late 1800s there was a volcano explosion (with time i will recall the name of the mount) that caused parts of Europe and the US to experience a whole year without summer (due to the volcanic ash changing the climate patterns for the year). Imagine what an asteroid/meteorite/(God-forbid)Comet could do!

[Junior]

TUCvER ping.

[Revolting cat!]

"Everybody loves somebody sometime..."

[tang-soo]

Sorry - couldn't resist. By the way, post number 2 is about the creepiest thing I've ever seen. The bugs are gross too.

[gcruse]

Cool evidence.

[qam1]

One more piece of the puzzle, called "The Extinction of Dinosaurs by Asteriod Impact."

No, It's just another example of media hound scientist grasping at straws trying to prop up what should be a long dead hypothesis.

1st - In regards to the so called Asteroid who cares what happened after the K-T event since there is increasing evidence that the Chicxulub crater predates the end-Cretaceous mass extinction by about 300,000 years. (More links here and here)

2nd, Dinoflagellates. Brinkhuis and Zachariasse (1988)record no accelerated rates of extinction across the K-T boundary in Tunisia.

So let me get this straight, The Sky was darkened which allowed the benthic foraminifera to move into a new area, Yet in that area Dinoflagellates who depend on sunlight and would be devastated in 6 months without it survived with no ill effects in the same area.

3rd, This is just one small area where there could be many reasons for a localized cooling effect. By focusing on one tiny area and ignoring the rest of world the scientist are being disingenuous at best.

In the rest of the world, Micro fossils show a different story, For example

a)   Diatoms. The K-T event did not much affect the diatoms. Harwood (1988), based on studies from Seymour Island, eastern Antarctic Peninsula, the first to record siliceous microfossil assemblages across a K-T boundary sequence, notes that diatom survivorship across the K-T boundary was above 90 percent. Resting spores increase from 7 percent below to 35 percent across the K-T boundary.

b)  Dinoflagellates. Dinoflagellates also were little affected by the K-T event (Bujak and Williams, 1979). Hultberg (1986) in Scandinavia records no accelerated rates of extinction across the K-T boundary . Danish dinoflagellates responded more by appearance of new species than by extinctions (Hansen, 1977), as did Seymour Island assemblages (Askin, 1988).

c) Yes other plankton did suffer massive extinctions but it wasn't because of the Asteroid or K-T event.

Marine calcareous microplankton, the coccolithophorids and planktonic foraminifera, were hit hardest of all by the K-T event. Thierstein (1981) proposes that the coccolithophorids extinctions were the most severe plankton extinction event in geologic history; via a "deconvolution" process, Thierstein (1981, 1982) reduced a Cretaceous-Tertiary "transition," in which Cretaceous assemblages were replaced by "new" Tertiary taxa, to an instantaneous catastrophe. Perch-Nielsen et al. (1982) note that the "catastrophic event"at the K-T boundary did not result in geologically instant extinction of the calcareous nannoplankton, and that most Cretaceous species survived the event. At DSDP Site 524, a sample above the K-T boundary contains 90 percent Cretaceous species. Isotopic analysis indicated that the Cretaceous species were not reworked specimens, but represented survivors of the K-T event that continued to reproduce in the earliest Tertiary oceans. The relict species became extinct some tens of thousands of years after K-T boundary time, probably via environmental stresses.

Finally, Microfossils were actually found in the Chicxulub crater itself!!! and even though they are essentially at "Ground Zero" they show no ill effects. So how could an Asteroid cause negative effects on life on the other side of the globe but not where it hit?

[SunkenCiv]

Just adding this to the GGG homepage, not sending a general distribution.

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[SunkenCiv]

Asteroids: Deadly Impact National Geographic	Shoemaker: The Man Who Made An Impact by David H. Levy	Restless Earth Collection National Geographic

(similar, newer thread)

[SunkenCiv]

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[SunkenCiv]

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