This has always bothered me during field mapping: A boudin with two stretching directions has the form of an M&M candy (or almond shape). What do I do to measure the two stretching directions if the surrounding rocks don't show any stretching lineations. Does anybody have experience with this?

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    $\begingroup$ I know nothing of the topic, but +1 for chocolate $\endgroup$ – gerrit Apr 17 '14 at 14:17
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    $\begingroup$ @gerrit It get even funnier if you know that the word boudin means "sausage". $\endgroup$ – tobias47n9e Apr 17 '14 at 14:23
  • $\begingroup$ Can't you just measure the length of the major and minor axes of the ellipse? Or the 3 axes if that is important. $\endgroup$ – haresfur Apr 18 '16 at 3:45
  • $\begingroup$ Have a look: LINK. And for radial boudins here: LINK. $\endgroup$ – Bendaua Jul 12 '16 at 12:11

If you can't get a macroscopic sense of lineation, try microscopic measurement (thin sections along the supposed plane principal stresses) and transfer them in macro. The Techniques of Modern Structural Geology: Strain Analyses Vol I would be very useful for reference.

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