QUOTE(Melissa @ Aug 21 2006, 10:34 PM)

QUOTE(DesertYeti)
1) an elk's pelvis MUST roll to go from horizontal to vertial, about 90 degrees...no the flank hair will not be totally wiped out...why? Because the hair is simply lifted up and away from the substrate...no smearing...very simple, get over it.
Wrong. While the elks pelvis MUST roll, there MUST be momentum to do so.
Wrong. There does not NEED to be any momentum to roll an elk pelvis.
Since no one caught this, and there is already plenty of uninformed ranting in this thread, I feel obligated to correct this one, even though it is totally unimportant in the grand scheme. I'm not trying tp pick on Melissa either Basic physics tells us there only needs to be a strong enough force to move any object. Momentum (mass x velocity) can be helpful, but is not necessary. For example, an elk extending it's legs to create a see-saw effect to roll itself over is not because of momentum. This is NOT to say that an elk doesn't use or even need some momentum to stand up. It might take some momentum for the elk to get its main body mass all the way over it's tucked under feet and then get up, but the majority of the body better be well off the ground by then, and that might even be aided by momentum. But momentm is not a requisite for rolling a pelvis as Melissa has claimed. This is partly semantic and does not really change Melissa's main point (as I understood it), but I would side with DY on an elk's ability to stand up without having to roll around enough to smear it's hair impression (e.g create a lot of momentum). I'm sure that anyone who has closely examined an ungulate impression (as many have claimed) can enlighten us on whether or not hair can usally be seen if the substrate is good enough. :wink:
Also Melissa, with all due respect, if you cannot see these two features as resembling eachother in mirror image like DY explained, then maybe you should be more sympathetic as to to why he has totally given up on participating in this thread.
Click to view attachment(Don't the symmetrical divots seem a little interesting?)
As for the slip/wrist#2...I wasn't happy with the slip interpretation when first proposed (by Colobus) because it seemed to me a remarkable coincidence that two trackways (or even two elk?) would happen to slip from different places and have their hooves end up in EXACTLY the same place. I reconciled that to assume it was probably one slip with the hoof sliding in from one direction and sliding out in the other direction...but that would require a significant change in body position, at least a 45 degree pivot if that interpretation is correct. To me, that might help explain a number of possible anamolies as to why this impression doesn't match a standard elk impression. That is, the elk slipped when getting up or down, it's weight dramatically shifted, it's tracks ended up other than where predicted, etc. Of course we'll never know, but if anything, that slippage helps bolster the elk theory in my mind by adding anamolous elk tracks into an 'unorthodox(?)' impression.
[Speaking of which, there has been a lot of discussion and presumption about how elk do or do not get up, not to mention many bold statements about features that are "always" or "never" present etc. I don't think anyone here would presume to know, have seen, have studied, have documented, have witnessed, or even have imagined every conceivable way an animal like an elk can get itself off the ground. What if it has a broken leg, strained thigh muscle, or even a missing foot? Maybe it has broken antlers and it's weight and balance is all screwed up. Maybe it is infected with the meningeal brain worm Parelaphostrongylus tenius
and has neuro deficits? Or maybe it's perfectly healthy but the elk was startled and jumped up quickly and awkwardly- without urinating? Maybe one foot slipped (hmmm)? Maybe it stepped on uneven ground and had to readjust suddenly? I could go on and on but assume my point has been made.]But now I wonder if it is even a hoof slippage to begin with? I can see it both ways (wrist or hoof) based on the not-so-great images provided so far. It seems to me that part of the reason for having cloven hooves is to provide traction and that a properly functioning cervid hoof would splay open (in front) to catch itself when slipping forward in mud to show the two points normally pressed together in elk tracks- but I really have no idea other than what I know about hoof anatomy and what I see (but never bother to study) in buffalo, duiker and bushbuck tracks in the mud on almost a daily basis. (Shouldn't we also see the other two vestigal digits if it slipped and was this deep?) Maybe it was too wet and that detail was lost in the suction of pulling the hoof out? Or maybe it's there, I just can't tell from the images? Or maybe it doesn't really happen that way and I should stick with gorillas? It just seems like, upon closer inspection, the impression isn't very sharp for a hoof mark and also seems to widen towards the base (without splaying). This feature seems like a huge dilemma to me in that, the experts in this regard all agree it is from an elk, but DDA and Colobus are sure it is a hoof (or hooves) while DY says it is another wrist. How can we debate or distinguish finer features in the overall impression if we can't even agree on the difference between elk hooves and elk wrists?
DDA- thanks for the hairflow on the achilles area. I think we all see the hair flow along the lines as you've drawn but what is the justification for the direction of the arrow heads? I assume something shows hair tips as apposed to roots and wonder if you or anyone else can illustrate this.
Thanks also for your thoughts on the dermals. I still do not see the margin where the hair is said to stop but guess I can only expect so much from images and will add that to my list for if/when I can examine the real deal. I'll keep trying to get insight from Jimmy and Jeff on this aspect.
Apeman
edited to try to diminish the initial harsh tone- perhaps unsuccessfully.....