Paleonet: a Pyrenean question

[Allen Aigen]

Raul,
I would guess that the thicker, more complex 'mega beds' are closer to the source and thin out distally, dropping the breccia etc.  If you get an answer to your puzzle, please let us know.


Allen Aigen
SeriRach at juno.com

-- Tim Demko <tdemko at d.umn.edu> wrote:
Raúl:
Mariano Marzo (mariano.marzo at ub.es) and Pau Arbues (pau.arbues at ub.es) at the University of Barcelona are the experts I know on all things Jaca (and Ainsa, if you are visiting there, too). They personally have taken me to the megabeds several times. You'll love it. 
On May 28, 2007, at 11:18 PM, Esperante, Raul (LLU) wrote:Dear paleonetters: This questions dos not fit stratight into paleontology, although it might be of interest for some people. I am preparing a field trip to the Spanish Pyrenees this summer, and in reading the literature about the turbidites of the Hecho Group in the Jaca basin, I found that there descriptions of two "megas". Rupke (1976) describes nine megabeds, consisting of two units each (a lower calcarenite, and an upper marlstone), of a maximum thickness of 55 meters. Several other authors describe megaturbidites, interestingly nine of them too, but of greater thickness (up to 200 m) and consisting of four subunits, including a lower unit of great blocks of of carbonates, a breccia, and two more units above. The pictures of both megabeds and megaturbidites do not show the same features, but it seems that both can be traceable tens or kilometers and are mappeable using aerial pictures. I am confused. Are they describing the same "megas"? Since the paleonet community is quite big, I wonder if anyone could orient me on this or redirect this email to someone knowledgeable. Raúl EsperantePaleontologistGeoscience Research InstituteLoma Linda, California 92373Tel (909) 558 4548FAX (909) 558 4314_______________________________________________Paleonet mailing listPaleonet at nhm.ac.ukhttp://mailman.nhm.ac.uk/mailman/listinfo/paleonet


--
Tim Demko   tdemko at umn.edu
Assistant Professor
Department of Geological Sciences
University of Minnesota Duluth
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