[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Largest Camarasaurus specimens
In Greg Paul's Field Guide, the largest C. supremus specimen is listed at 18
meters long and 23 tonnes. If C. supremus scaled up isometrically, then a 23
meter long C. supremus would be (23/18)^3=~2.08 times as massive, or ~47.98
tonnes. I'm not sure how accurate Greg's plasticine models are as they are not
reproducible, but even if his original mass estimate was 15% too high (so
instead of 23 tonnes, 19.5 tonnes), you still get a mass estimate of roughly 40
tonnes for the 23-meter animal.
On the other hand, many if not all of Greg's mass estimats are problematic. A
GDI volume estimate of Supersaurus based on Scott Hartman's skeletal gave me a
roughly 24 tonnes, which is only about 2/3 the mass that is listed in the Field
Guide. Maybe and 18-meter C. supremus was "only" 15 or 16 tonnes, not 23 tonnes.
My question is: where does the 23 meter-long Camarasaurus estimate come from?
Wikipedia lists the reference as Foster, J. (2007). Jurassic West: The
Dinosaurs of the Morrison Formation and Their World. Indiana University Press.
p. 201 (which I do not have). Google books only gives a snippet preview so I
----- Original Message -----
> From: David Marjanovic <firstname.lastname@example.org>
> To: DML <email@example.com>
> Sent: Tuesday, May 22, 2012 4:38 PM
> Subject: Re: Largest Camarasaurus specimens
>> Does any one have any references for the largest Camarasaurus
>> specimens (especially C. supremus). I've heard size estimates of 23
>> meters long and 47 tonnes
> I have no idea, but I can say with a fair amount of certainty that 47 tonnes
> a 23-m-long animal that is not a whale is ludicrous. 10 t, OK; 20 t, OK; 30
> if it's proportioned like a sumo wrestler, why not. 47 t? No way.
> I guess this figure was derived by measuring the water displacement of a
> commercial model that violated Holtz's First Rule of Skeletal Restoration*,
> using the rounded density of an unspecified lizard.
> * "If the skeleton doesn't fit inside the model, the model is