"Stratele de Bizusa" sunt constituite din marne cenusii-albicioase, slab bituminoase cu cardiacee si ostracode.

“The Bizusa Layers” are composed of white-gray slight bituminous marls containing Ostracodes and Cardiaceas.
(vezi site-ul de mai jos, e biling - pluralul cu -s însă nu cred că e ok).

Pare să fie o familie de moluşte :-)

Species of Protocardia are common in Jurassic and Cretaceous strata and some species were clearly as tolerant of abnormal salinities as is the modern cockle - Cardium or Cerastoderma. There is no reason to believe that the salinity was abnormal in the case of the Kimmeridge Clay, but deficiency of oxygen may have been a problem at times. Protocardia can be described as a bivalve of rounded quadrate shape, that is equilateral. The beaks are directed inwards. The notable feature is the presence of radial ribs on the posterior slope. The remainder of the shell has fine comarginal ribs (ribs parallel with the margin). It is quite easily recognised by the ribs on one side only. It belongs to the Superfamily Cardiacea.



--------------------------------------------------
Note added at 4 hrs (2011-05-06 15:06:51 GMT)
--------------------------------------------------

Are doar formă de plural:

Car·di·a·cea
noun pl
Definition of CARDIACEA
: a suborder of Eulamellibranchia comprising the cockles and related mollusks
http://www.merriam-webster.com/dictionary/cardiacea

--------------------------------------------------
Note added at 2 days22 hrs (2011-05-09 08:14:12 GMT) Post-grading
--------------------------------------------------

Pentru puţin. Mulţumesc şi eu :-)