Re: CERATOPSIAN

[DINO RUSS <jacobson@geoserv.isgs.uiuc.edu>]

>At 09:41 PM 10/22/97 -0500, Rob Meyerson wrote:
>>Stanley Friesen writes,
>>
>>
>>The Ruby Site, a hadrosaur dominated bonebed in the NW corner of
>>South Dakota, has some _Triceratops_ material (Hell Creek Formation).
>>The depositional environment has been concluded to be a high-energy
>>fluvial environment (water was moving fast).  I would assume that
>>this would also suggest that it was also an inland deposit.
>
>Not in the Hell Creek of South Dakota, it doesn't.  Especially given the
>recent evidence that the inland sea didn't retreat as far as has been
>previously assumed.
>
>If you check, I bet you will find the site is only a hundred meters or so
>above the Fox Hills locally - maybe less.  (The Fox Hills is the regressive
>coast line of the inland sea).
>
>I would say it rather suggests a major river channel, perhaps during the
>early stages of a flood.
>

In the area of Hell Creek I work (a little east of the Ruby Site - SE of
the Lemmon SD area) the Hell Creek is about 130 meters thick (above the Fox
Hills). The better dinosaur material (preservation/abundance ect) seems to
occur in the interval about 20 meters or less above the Fox Hills which is
well exposed just a few miles east of us in stream cuts.

Russ  Jacobson

>--------------
>May the peace of God be with you.         sarima@ix.netcom.com
>                                          sfriesen@netlock.com


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