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Did Triassic Asteroid Impact Spare the Dinosaurs? - 08-13-2001
Like homicide detectives searching for a mass murderer, scientists are trying to find the culprit behind one of the biggest killings in Earth's history.

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Misleading story
by: cbehrens40 (22/M/Fords, NJ)
08/13/01 10:52 am
Msg: 1 of 69
 
Two major problems with the article:

1.) There were two extinctions in the late Triassic, on at 220.7 Ma, and one near the end, at 205.1 Ma. These two extinctions affected different groups, and in neither situation were dinosaurs nor mammals severely affected. The second extinction is often tied to massive volcanism, but this occurred at 201 Ma, after the extinction. The first is tied to the Manicouigan crater, which occurred somewhere between 215 and 210 Ma, after the end-Carnian.

2.) Dinosaurs and mammals (well, protomammals) had already significantly diversified even in the face of stiff competition from the reptilian-amphibian megafaunal assemblage. Both groups had significant evolutionary advancements over the other groups. Further, the groups of dinosaurs Paul Olsen sites as not appearing until the Jurassic, such as large predators, sauropods, and the like, had already diversified by 215 Ma. I don't have the source in front of me (I'm at work), but a French journal in 2000 published an article by Michael Benton about a Triassic sauropod, and Paul Sereno describes some early sauropods in "The Evolution of Dinosaurs", Science 268 (it was a special issue).

In actuality, The Triassic extinction has been horribly researched, and there is little evidence to date that any extinction in the oceans can be linked to extinctions on the land. I have spent a great deal of my undergraduate years researching this one, and the data just aren't there yet to support any statement that the dinosaurs passively ecologically replaced the previous megafauna, and vice versa. This whole area needs a lot more work, and I think it should begin by asking some more fundamental questions than the current research asks.

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69   Re: Speed of light oops
ned_ludd_jr      08/13/01 01:15 pm
68   Re: What Asteroid???
greywulff76      08/13/01 01:15 pm
67   Speed of light disproves young earth
ned_ludd_jr      08/13/01 01:14 pm
66   Re: What Asteroid???
thelordmega      08/13/01 01:13 pm
65   Re: What Asteroid???
tat2god      08/13/01 01:12 pm
64   Re: What Asteroid???
thelordmega      08/13/01 01:12 pm
63   Re: What Asteroid???
travelabound      08/13/01 01:10 pm
62   Re: too funny
greywulff76      08/13/01 01:08 pm
61   Re: What Asteroid???
tat2god      08/13/01 01:07 pm
60   Re: too funny
livengood_420      08/13/01 01:07 pm
59   Re: What Asteroid???
greywulff76      08/13/01 01:04 pm
58   Re: Jesus Didn't say anything bout Dinos
livengood_420      08/13/01 01:03 pm
57   too funny
greywulff76      08/13/01 01:03 pm
56   Re: Misleading story
cbehrens40      08/13/01 01:03 pm
55   Re: Jesus Didn't say anything bout Dinos
joe_momma7_1      08/13/01 01:02 pm
54   Re: The Tyranny of Ducks
azwypz      08/13/01 01:00 pm
53   Re: What Asteroid???
livengood_420      08/13/01 12:58 pm
52   Re: The Tyranny of Ducks
BrienMalone      08/13/01 12:58 pm
51   culprit?
greywulff76      08/13/01 12:57 pm
50   Re: Noah's Ark was a Spacecraft from Mar
livengood_420      08/13/01 12:55 pm
49   Re: What Asteroid???
greywulff76      08/13/01 12:53 pm
48   Re: Jesus Didn't say anything bout Dinos
livengood_420      08/13/01 12:53 pm
47   Re: Noah's Ark was a Spacecraft from Mar
azwypz      08/13/01 12:53 pm
46   Re: Noah's Ark was a Spacecraft from Mar
livengood_420      08/13/01 12:52 pm
45   Re: Noah's Ark was a Spacecraft from Mar
senojeilra      08/13/01 12:51 pm
44   Re: What Asteroid???
livengood_420      08/13/01 12:51 pm
43   Re: Jesus Didn't say anything bout Dinos
BrienMalone      08/13/01 12:50 pm
42   Re: Noah's Ark was a Spacecraft from Mar
livengood_420 1    08/13/01 12:49 pm
41   Re: What Asteroid???
greywulff76      08/13/01 12:49 pm
40   Re: What Asteroid???
livengood_420      08/13/01 12:47 pm
39   Re: Jesus Didn't say anything bout Dinos
greywulff76      08/13/01 12:46 pm
38   Re: Noah's Ark was a Spacecraft from Mar
azwypz      08/13/01 12:45 pm
37   Re: Noah's Ark was a Spacecraft from Mar
livengood_420      08/13/01 12:44 pm
36   Re: What Asteroid???
greywulff76      08/13/01 12:43 pm
35   Re: Noah's Ark was a Spacecraft from Mar
azwypz      08/13/01 12:43 pm
34   Re: Noah's Ark was a Spacecraft from Mar
habitualbicher      08/13/01 12:41 pm
33   Re: Noah's Ark was a Spacecraft from Mar
thelordmega      08/13/01 12:40 pm
32   Re: What Asteroid???
tat2god      08/13/01 12:39 pm
31   Re: Noah's Ark was a Spacecraft from Mar
petsings      08/13/01 12:39 pm
30   Noah's Ark was a Spacecraft from Mars
azwypz      08/13/01 12:34 pm

 
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