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Re: sauropod facultative sprawl?

 Wow. Is there any way to know whether tracks with wider-guage
 forelimb placement versus narrower-guage forelimb placement come from
 different taxa, or are these trackways too generic (so to speak)?

They're always attributed to different taxa -- Diplodocimorpha vs. Titanosauriformes (the broadest ones are attributed to titanosaurs). This fits the femur shapes of those sauropods.