@john It was the confluence of several things - assuming tails don't go past vertical, getting a more realistic degree of flexion in the knee and ankle, and some small refinement to pectoral girdle placement. It's in my stack of like 3 dozen blog posts I have a planning folder for but never actually finished.
@mike @john We do here. Turns out sauropod tails go horizontal when I made other (IMO improved) assumptions about foot and pectoral posture, so the synergy with the biomechanical improvement makes it a strong argument to me. Also, while hadrosaurs and prosauropods once got the "tails arched in the air" treatment, those are clearly wrong, so with it not being normal to dinosaurs and there being no extant analog I think the "tail-arching up" model is coasting on social inertia at this point.
@john @ScottHartman Well, the keystoning is real and ubiquitous. But I am more inclined to think that the base of the tail was typically inclined somewhat upwards. See discussion at https://svpow.com/2020/04/22/what-can-sauropod-sacra-tell-us-about-neck-posture/
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