To: DBrow
I don't think there is an irridium layer associated with it. Don't ask me why there wouldn't be an irridium layer, I don't have a clue
To: bobdsmith
If the impactor was a comet head, there'd be mostly water, as opposed to a rocky-type asteroid. Just guessing.
36 posted on
06/01/2006 2:51:09 PM PDT by
DBrow
To: bobdsmith; RadioAstronomer
Don't ask me why there wouldn't be an irridium layer, I don't have a clue I wonder if an impact created from lunar rock would leave an iridium signature.
43 posted on
06/01/2006 2:59:02 PM PDT by
Centurion2000
(The social contract is breaking down.)
To: bobdsmith
Don't ask me why there wouldn't be an irridium layer, I don't have a clueAn abundance of iridium.....layered, would prove cometary/asteroid impact.
To: bobdsmith
I don't think there is an irridium layer associated with it. Don't ask me why there wouldn't be an irridium layer, I don't have a clue Another hypothesis .... an ice impact wouldn't leave iridium signatures either.
45 posted on
06/01/2006 3:03:39 PM PDT by
Centurion2000
(The social contract is breaking down.)
To: bobdsmith
Not all impactors are high in iridium. It's just that iridium is far more common interplanetary debris than it is on Earth, and an iridium layer *can* be indicative of a large impact event.
An iron-nickel meteorite may contain little or no iridium.
143 posted on
06/02/2006 7:12:50 AM PDT by
Heavyrunner
(Socialize this.)
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