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Re: Florida meteorite impacts?
Hello, Bernd:
Many, many thanks for the information. It is exactly what I was looking
for. And I will take your advice about "impact" ;-) I'm a graduate
student in epidemiology and you would not believe the many differences
between rates, proportions, and ratios (in a medical context), all of
which everyone else in the civilized world simply calls "rates".
Thanks again,
Bo Widerberg
>From meteorite-list-request@meteoritecentral.com Thu Sep 17 10:07:27
1998
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>Bo Widerberg schrieb:
>
>> Hello, All:
>>
>> I was wondering if perhaps someone out there in the ether could
>> provide me with any information on meteorite impacts (finds or falls)
>> in Florida.
>> Thanks in advance to all who can provide any information. - Bo
>> Widerberg
>
>Hello Bo, hello List!
>
>There have been only 4 meteorite f i n d s in Florida so far:
>
>1. Bonita Springs - H5
>
>One stone of 41.8kg was found in Lee County in 1938, and recognized as
>meteoritic in 1956 -- 26=B0 16' N / 081=B0 45' W
>
>2. Eustis - H4
>
>A stone of 502g was ploughed up in Lake Co. in 1918 -- 28=B0 50'
N/081=B0
>41' W
>
>3. Grayton* - H5
>
>A single mass of 11.3 kg was found near Grayton Beach in Walton County
>in 1983. -- 30=B0 18' 42 N / 086=B0 10' W
>
>4. Okechobee - L4
>
>Fragments weighing about 1kg were brought up in a net some 0.75 miles
>from the shore - Palm Beach County - 26=B0 41' N - 080=B0 48' W - some
ti=
>me
>before 1916.
>
>
>* POVENMIRE H. (1984) The Grayton Beach Meteorite (S&T, 1984 March, p.
>204):
>On October 30, 1983, two treasure hunters were searching for Spanish
>armor at an ancient Indian midden near Grayton Beach, Florida. Using
>metal detectors, P.W. Gibson and J.M. Green, M.D., found instead a
>24-pound brown rock (9 by 71/2 by 7 inches) buried under three feet of
>sand. Certain it was unnatural to the area, they contacted the Earth
>Sciences department at Pensacola Junior College. Profs. W. Wooten, F.
>Palma, and K. Exum suspected the rock was a meteorite and sent a piece
>of it to me for examination.
>At first glance the specimen looked not meteoritic but instead similar
>to the ferrous sandstone nodules frequently found along our beaches.
>But, after learning of the circumstances of the find, I started routine
>tests, including a point-by-point comparison with several genuine stony
>meteorites in the Florida Fireball Patrol=92s collection. Eventually, I
>classified the meteorite as an olivine-bronzite chondrite. Small pieces
>were sent to G.I. Huss of the American Meteorite Laboratory and to the
>British Museum for thin-section analysis. This resulted in a tentative
>H5 classification, a fairly common type of iron-poor stony chondrite.
>I visited the discovery site, and it soon became clear that the
>meteorite had almost certainly been carried to the midden. Pottery
>sherds found in the area date from the region=92s "Wedden Island"
culture=
>,
>which existed from about A.D. 350 to 1200, whereas the chondrite=92s
fres=
>h
>appearance suggests that it fell within the past several centuries. No
>other meteoritic fragments were located.
>This find will appear in the newest Catalogue of Meteorites, edited by
>A. Graham. It will be named the "Grayton Beach meteorite" (HAROLD
>POVENMIRE, Florida Fireball Patrol 215 Osage Dr., Indian Harbour Beach,
>Fla. 32937).
>
>
>... and, by the way, be careful with the word "impact" ;-)
>
>Meteoriticists use this word only when there is a s i z a b l e
>"hole" or even a "crater".
>
>Thus, the NORTON COUNTY Ca-poor aubrite produced an impact hole (about
>10 feet deep), though the main mass weighed about 1 ton.
>
>The largest individual of the JILIN (H5) shower weighing 1770 kg
>produced a considerable impact hole (about 20 feet deep) but not an
>impact crater.
>
>The Binningup (H5) chondrite (488 gr) landed within 4-5 metres of two
>sunbathers on the beach and excavated an "impact pit" 30 cm in diameter
>and 15 cm deep in soft sand.
>
>Best wishes from cold, rainy, stormy, and overcast Germany,
>
>Bernd
>
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