https://www.sci.news/geology/massive-australian-precambrian-cambrian-impact-structure-13283.html

If this crater (inner ring ~600 km, outer ring ~2000 km) proves out,
this would make it the largest known impact event. Chixilub is small
potatoes compared to it. Controversy surrounds the finding.

Publication in scientific literature is forthcoming, but not yet
available. This would have obvious implications for the end-Ediacaran
mass extinction.

On 9/24/24 16:48, erik simpson wrote:
> https://www.sci.news/geology/massive-australian-precambrian-cambrian-impact-structure-13283.html
>
> If this crater (inner ring ~600 km, outer ring ~2000 km) proves out,
> this would make it the largest known impact event.  Chixilub is small
> potatoes compared to it.  Controversy surrounds the finding.
>
> Publication in scientific literature is forthcoming, but not yet
> available.  This would have obvious implications for the end-Ediacaran
> mass extinction.

What evidence do you have for the idea that there was a mass
extinction at the end of the Ediacarian?

With the Paleozoic, you had the formation of hard materials
that could more easily fossilize.

Was the lack of fossils just lack of hard structures.

Your use of the words 'end-Ediacaran mass extinction'
implies that you think that a mass extinction during
the time period was at least obviously true to yourself.

If you are interested in convincing others that such
a mess extinction existed, provide evidence.

On 9/25/24 2:46 AM, x wrote:
> On 9/24/24 16:48, erik simpson wrote:
>> https://www.sci.news/geology/massive-australian-precambrian-cambrian-impact-structure-13283.html
>>
>> If this crater (inner ring ~600 km, outer ring ~2000 km) proves out,
>> this would make it the largest known impact event.  Chixilub is small
>> potatoes compared to it.  Controversy surrounds the finding.
>>
>> Publication in scientific literature is forthcoming, but not yet
>> available.  This would have obvious implications for the end-Ediacaran
>> mass extinction.
>
> What evidence do you have for the idea that there was a mass
> extinction at the end of the Ediacarian?
>
> With the Paleozoic, you had the formation of hard materials
> that could more easily fossilize.
>
> Was the lack of fossils just lack of hard structures.
>
> Your use of the words 'end-Ediacaran mass extinction'
> implies that you think that a mass extinction during
> the time period was at least obviously true to yourself.
>
> If you are interested in convincing others that such
> a mess extinction existed, provide evidence.
>
>
The end-Ediacaran extinction is well known. Almost all the Ediacaran
fauna disappeared. The classical explanation includes increased oxygen
in the water column, predation by early Cambrian animals with hard
feeding appendages and bioturbation of the bacterial/algal mat that
supported the "mudstickers" of the Ediacaran.

There are plenty of soft-bodied organisms fossilized in the Cambrian.
I'm not interested in convincing you or anyone else in the reality of
the extinction. A little research is all anyone neeeds.

On 9/25/24 08:10, erik simpson wrote:
> On 9/25/24 2:46 AM, x wrote:
>> On 9/24/24 16:48, erik simpson wrote:
>>> https://www.sci.news/geology/massive-australian-precambrian-cambrian-impact-structure-13283.html
>>>
>>> If this crater (inner ring ~600 km, outer ring ~2000 km) proves out,
>>> this would make it the largest known impact event.  Chixilub is small
>>> potatoes compared to it.  Controversy surrounds the finding.
>>>
>>> Publication in scientific literature is forthcoming, but not yet
>>> available.  This would have obvious implications for the
>>> end-Ediacaran mass extinction.
>>
>> What evidence do you have for the idea that there was a mass
>> extinction at the end of the Ediacarian?
>>
>> With the Paleozoic, you had the formation of hard materials
>> that could more easily fossilize.
>>
>> Was the lack of fossils just lack of hard structures.
>>
>> Your use of the words 'end-Ediacaran mass extinction'
>> implies that you think that a mass extinction during
>> the time period was at least obviously true to yourself.
>>
>> If you are interested in convincing others that such
>> a mess extinction existed, provide evidence.
>>
>>
> The end-Ediacaran extinction is well known.  Almost all the Ediacaran
> fauna disappeared.  The classical explanation includes increased oxygen
> in the water column, predation by early Cambrian animals with hard
> feeding appendages and bioturbation of the bacterial/algal mat that
> supported the "mudstickers" of the Ediacaran.
>
> There are plenty of soft-bodied organisms fossilized in the Cambrian.
> I'm not interested in convincing you or anyone else in the reality of
> the extinction.  A little research is all anyone neeeds.

Sounds like a bunch of hand-waving, because.

You are not interested in what is true.

I will not give you any benefit of doubt.

But it seems feasible to me that there might have been one
at the time, who knows.