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PDFs are only produced by extreme shock compressions on the scale of meteor impacts. They are not found in
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Langenhorst, F.; Deutsch, A. (1993). "Orientation of Planar
Deformation Features (PDFs) in quartz".
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environments. Their presence therefore is a primary criterion for recognizing that an
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Planar deformation features in quartz identify it as shocked quartz
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16:Microscopic features of silicate grains
104:Lunar and Planetary Science Conference
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717:. You can help Knowledge (XXG) by
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676:Lunar and Planetary Institute
508:Cretaceous–Paleogene boundary
568:Planar deformation features
28:Planar deformation features
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671:Impact Field Studies Group
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154:Impact cratering on Earth
641:William Kenneth Hartmann
307:Clearwater East and West
255:Confirmed≥20 km diameter
558:Ordovician meteor event
661:Eugene Merle Shoemaker
538:Late Heavy Bombardment
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682:Traces of Catastrophe
666:Earth Impact Database
614:Ralph Belknap Baldwin
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769:Mineralogy concepts
116:1993LPI....24..849L
578:Shock metamorphism
483:Alvarez hypothesis
80:Shock metamorphism
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52:crystal structure
40:silicate minerals
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774:Mineralogy stubs
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528:Impact structure
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719:expanding it
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651:Graham Ryder
573:Shatter cone
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563:Philippinite
412:Saint Martin
407:Rochechouart
312:Gosses Bluff
267:Amelia Creek
170:Impact event
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63:impact event
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447:Tookoonooka
432:Steen River
422:Siljan Ring
352:Manicouagan
337:Keurusselkä
758:Categories
711:mineralogy
588:Stishovite
488:Australite
467:Yarrabubba
437:Strangways
397:Presqu'île
372:Montagnais
342:Lappajärvi
292:Charlevoix
277:Beaverhead
272:Araguainha
226:By country
196:Antarctica
86:References
553:Moldavite
548:Meteorite
533:Impactite
462:Woodleigh
457:Vredefort
417:Shoemaker
377:Morokweng
362:Mistastin
302:Chicxulub
206:Australia
186:Worldwide
42:(usually
607:Research
452:Tunnunik
347:Logancha
317:Haughton
287:Carswell
231:Possible
69:See also
59:volcanic
48:feldspar
598:Tektite
593:Suevite
498:Coesite
493:Breccia
442:Sudbury
392:Popigai
387:Obolon'
367:Mjølnir
332:Karakul
322:Kamensk
282:Boltysh
262:Acraman
112:Bibcode
110:: 849.
476:Topics
357:Manson
211:Europe
191:Africa
44:quartz
36:grains
709:This
179:Lists
30:, or
715:stub
327:Kara
32:PDFs
46:or
38:of
760::
108:24
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54:.
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118:.
114::
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