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Re: Hell Creek seaway
> In a message dated 97-03-03 23:54:01 EST, you write:
> > Some taxa like Myledaphus and earlier undescribed genera in
> > the lineage have never or very rarely been found in marine strata.
> > Lisodus is known in freshwater back to the Triassic.
> Thomas R. Lipka
> Paleontological/Geological Studies
> And we have fresh water occurrences of Hybodus sp, (I think Salmon-like)as
> well as >Lissodus
Some species freshwater and some marine.
> and Ticodus (spelling?)Yes, what taxon is this. Could you send me a complete
> vertebrate faunal
list for the Arundel.
> in the Arundel Clay (Aptian) of Maryland too!
And where did you get an Aptian age. Everything I have says Albian.
>Athough the proximity of the depositional basin at that time was very
>close to the sea it could mean that te above were anadromus or at least
>patrolled into fresher waters.
We see the same thing with Lepodotes in the Cenomanian Dakota Fm. Many
insist that it is a marine taxa, but we can document it as abundant in
riverine deposits far inland. However it also occurs in beach sands so I
believe it ranges regularly up and down rivers like striped bass.