[meteorite-list] Definitions of types of falls and finds

From: Mendy Ouzillou <mendy.ouzillou_at_meteoritecentral.com>
Date: Tue, 6 May 2014 11:20:40 -0700
Message-ID: <536927f8.637a420a.27dc.54ad_at_mx.google.com>

I've been thinking about the email Jeff sent out some time back and wanted
to propose a slightly different set of names and simplify the nomenclature.
You can see Jeff's original email below. I think we have all struggled with
defining meteorites that are neither observed falls nor finds and part of
the reason is that we were conflating too many ideas.
Observed fall: Observed to fall, either by eyewitnesses or with instruments.
The event was well documented. Physical evidence associated with the
collected meteorites is consistent with a fresh fall, or, when collection
does not occur immediately, the strewn field location (if there is one) and
appearance taking into account weathering associated with time on the
ground, may be directly attributed to the fall.
Correlated fall: No material was found immediately after an observed event,
but later analysis and physical evidence conclusively points to an observed
event on a specific date or within a very narrow range of dates.
Find: Material was found and no event can be conclusively associated with an
observed event. A find that appears like a fresh fall is still a find if no
observed event can be associated with it.
Feedback welcome.
Mendy Ouzillou
IMCA8393

-----Original Message-----
From: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of Jeff
Grossman
Sent: Saturday, January 05, 2013 6:26 AM
To: meteorite-list at meteoritecentral.com
Subject: Re: [meteorite-list] Meteorite Picture of the Day

I should add: my first two categories are types of falls, whereas the last
three are types of finds.

Jeff

On 1/5/2013 8:12 AM, Jeff Grossman wrote:
> In all seriousness, I have considered refining, or at least qualifying
> the definition of "fall." The categories I've considered are these,
> and the definitions are first passes:
>
> Observed fall: observed to fall, either visually or with instruments,
> and collected soon after the event. The event was well documented.
> Physical evidence associated with the collected meteorites is
> consistent with a fresh fall, or, when collection does not occur
> immediately, directly points to a fall at the time of the observed event.
>
> Unobserved fall: No observations were made of a fall event, but
> physical evidence conclusively points to a fall on a specific date or
> within a very narrow range of dates.
>
> Probable fall: In these cases, there was a well-documented meteor
> event with characteristics consistent with a meteorite fall, followed
> by the collection of meteorites some time later. There is a strong
> likelihood that the meteorite fell in the observed event, but physical
> evidence is not fully conclusive.
>
> Possible fall: The same situation as a probable fall, but there is
> significant doubt about whether the meteorite is connected to the
> event or about the reliability of the observations of the event.
>
> Doubtful fall: The same situation as a possible fall, but there is a
> high degree of doubt.
>
> This was all suggested by the circumstances surrounding the Bene?ov
> (a) and (b) meteorites, which I would have put in the "possible fall"
> category, if such a thing existed.
>
> Jeff
>
> On 1/4/2013 8:57 PM, Michael Farmer wrote:
>> I find this new attempt to change terminology disturbing. I have
>> hundreds of old catalogs from the top museums and dealers from more
>> than 200 years ago till today, all of them list falls and finds. None
>> of them discuss unobserved falls as an acceptable alternative.
>> Are we really ready to just accept anything thrown out there, and
>> watch as all manner of BS is used to discredit hundreds of years of
>> accepted terminology?
>> My private collection focuses on witnessed falls, with date and time
>> and science to back it up.
>> I am not interested in another group which would include every
>> meteorite ever to have fallen, since they did actually all fall at
>> some point.
>> Well, I guess Anne can delete her birthday fall calendar page since
>> now we can simply put every NWA on any date you choose to believe it
>> might have possibly fallen:).
>>
>>
>> Michael Farmer
>>
>> Sent from my iPad
>>
>> On Jan 4, 2013, at 6:47 PM, "Mike Bandli" <fuzzfoot at comcast.net> wrote:
>>
>>> If a meteorite falls from the sky and no one is there to hear it,
>>> does it make a sound?
>>>
>>> ;^]
>>>
>>> ----------------------------------------------
>>> Mike Bandli
>>> Historic Meteorites
>>> www.HistoricMeteorites.com
>>> and join us on Facebook:
>>> www.facebook.com/Meteorites1
>>> IMCA #5765
>>> -----------------------------------------------
>>>
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>>>
>>> -----Original Message-----
>>> From: meteorite-list-bounces at meteoritecentral.com
>>> [mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of
>>> hall at meteorhall.com
>>> Sent: Friday, January 04, 2013 5:36 PM
>>> To: Anne Black
>>> Cc: meteorite-list at meteoritecentral.com; valparint at aol.com
>>> Subject: Re: [meteorite-list] Meteorite Picture of the Day
>>>
>>> Right, Anne. That is why they are referred to as a "Fall" or a "Find".
>>> Concise!
>>> Cheers, Fred Hall
>>>
>>>> Every single meteorite ever found on Earth is necessarily the
>>>> result of a fall, they are not native to Earth. The only difference
>>>> is that some falls are seen, witnessed, and some, the vast majoriry,
are not.
>>>>
>>>> So calling them Observed or Unobserved falls is logical. That is
>>>> what happened to all of them.
>>>> That is simple reality.
>>>>
>>>>
>>>> Anne M. Black
>>>> www.IMPACTIKA.com
>>>> IMPACTIKA at aol.com
>>>>
>>>>
>>>> -----Original Message-----
>>>> tFrom: hall <hall at meteorhall.com>
>>>> To: Michael Farmer <mike at meteoriteguy.com>
>>>> Cc: meteorite-list <meteorite-list at meteoritecentral.com>; valparint
>>>> <valparint at aol.com>
>>>> Sent: Fri, Jan 4, 2013 6:13 pm
>>>> Subject: Re: [meteorite-list] Meteorite Picture of the Day
>>>>
>>>>
>>>> An "unobserved fall" is two words to describe the one word that
>>>> has been used for a century, "Find". The one word "Find" is good
>>>> enough for the Catalogue of Meteorites, it was good enough for
>>>> Harvey Nininger, and it is what I shall always use. Keep it concise.
>>>> Regards, Fred Hall
>>>>
>>>>
>>>>
>>>> That would make sense for say New Orleans, where a stone went
>>>> through a
>>>>> house and no one in their right mind would suggest that it did not
>>>> fall at
>>>>> that time say between 8 am and 4 pm when there was no hole in the
>>>> house,
>>>>> yet it was not seen to fall.
>>>>> An old rock found in a field does not suggest anything about fall
>>>> date. So
>>>>> it is a find, something never really argued against until now?
>>>>> It has crust which can suggest it is not thousands of years old,
>>>>> most
>>>> of
>>>>> our Springwater meteorites have black and blue crust but
>>>>> nevertheless
>>>> it
>>>>> is a find.
>>>>> Michael Farmer
>>>>>
>>>>> Sent from my iPhone
>>>>>
>>>>> On Jan 4, 2013, at 10:28 AM, <valparint at aol.com> wrote:
>>>>>
>>>>>> An "unobserved fall" is, well, a fall that was not observed, in
>>>>>> contradistinction to a fall that was observed. The terminology of
>>>>>> the Meteoritical Bulletin Database is "Observed fall: no".
>>>>>>
>>>>>> The information being conveyed is NOT that the meteorite fell but
>>>> that
>>>>>> the fall was not observed.
>>>>>>
>>>>>> In general, the questions about falling and finding are:
>>>>>>
>>>>>> 1) was the fall observed?
>>>>>> 2) if so, when was it observed?
>>>>>> 3) if not, is there any guesstimate of when it fell?
>>>>>> 4) regardless of weather it was observed or not, when was it
>>>>>> actually found?
>>>>>>
>>>>>> Paul Swartz
>>>>>> MPOD webmaster
>>>>>>
>>>>>>> What is an "unobserved fall"? Every meteorite fell at some
>>>>>>> point. I have thousands of unobserved falls in my collection.
>>>>>>> Michael Farmer
>>>>> ______________________________________________
>>>>>
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Received on Tue 06 May 2014 02:20:40 PM PDT