[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

New refs



 Well some more just came in:

 From the latest Contributions to Geology, University of Wyoming,
 volume 30, #2:

 Cifelli, Richard L. 1994. Therian mammals of the Terlingua local fauna
   (Judithian), Aguja Formation, Big bend of the Rio Grande, Texas.
   pp. 117-136.

 In the shadow of the dinos fauna - mammals  from teeth of course -
 some marsupials.

 Also, a detailed taphonomic analysis of the Carnegie Quarry (Morrison):

 Fiorillo, Anthony R. 1994. Time resolution at Carnegie Quarry (Morrison
     Formation: Dinosaur National Monument, Utah): implications for
     dinosaur paleoecology. pp. 149-156.

 Suggests that a detailed analysis of the taphonomy of the quarry shows
 an accumulation time of a few months to a few years and not that of
 more typical bone rain deposits which can be over 1000+ years. This
 suggests that you can actually talk about co-existence of taxa and
 suggests also, on the basis of tooth-wear patterns in Camarasaurus
 and Diplodocus that there was some resource partitioning of the food
 resources between the two. No surprise - would be interesting, if it
 works, to see if there is partitioning among age classes within taxa...

 In a similar vein (jugular?) there is, as mentioned earlier by someone:

 Varricchio, David J. 1995. Taphonomy of Jack's Birthday Site, a diverse
    dinosaur bonebed from the Upper Cretaceous Two Medicine Formation of
    Montana. Palaeo, Palaeo, Palaeo 114:297-323 (that's geography,
    climatology & ecology to those who don't call it palaeo cubed)

 Notes that it comes from a small, shallow floodplain lake with
 a transition from lake through shoreline to marginal shoreline/
 floodplain. 10 taxa of dinos and a variety of non-dino faunal
 elements making it a nice faunal sample for the region during
 Two Medicine Formation time (~74 ma). There's a time-averaged
 allochthonous element (transported in) and the more interesting
 associated local fauna which includes iguanodontids (3), Hypacrosaurus,
 Prosaurolophus and Gryposaurus as well as Troodon. The remains of these
 are clustered together. That is, taxa tend to be found more with other
 remains of the same taxon that you would expect at random. It's also
 the first described association of more than one Troodon (4 actually).
 He then discusses some possible mechanisms for the association including
 his favored drought or drought/disease (botulism) but they could also
 be single events as well. Nice study from my first view.

 Then there's:

  Little, C.T.S. & M.J. Benton. 1995. Early Jurassic mass extinction:
    a global long-term event. Geology 23(6):495-498.

 Summary of the end-Pliensbachian event (187 ma) suggesting it decimated
 lots of marine inverts worldwide. Wish the terrestrial deposits were
 up to looking for it on land more.

 That's it from within the beltway,   Ralph Chapman, NMNH