"Benthic foraminifers were also considered, mostely as bathymetric
indicators. In the upper part of Group and in group B, the most common
forms are: Cibicidoides, Anomalinoides, Gyroidinoides, Lenticulina,
Stilostomella, Heterolepa, Uvigerina, Planulina and Karreriella. The
plankton/benthos ratio varies between 2 and 6. IN the mudstones of Group C,
Lenticulinae are very common with a great number of species, followed by
NOdosariids and Uvigerinae, with a mean plankton/benthos ratio of 8.
"Similar associations are considered indicative of the upper bathyal zone
with depth range between 200 and 600 m. The presence of differentiated
species of Uvigerina in the whole succession is particularly important
because it may exclude depths shallower than 200 m." M. Gnaccolini et al,
"Sequence Stratigraphy of the Langhe Oligo-Miocene Succession, Tertiary
Piedmont BAsin, NOrthern Italy," in Mesozoic and Cenozoic Sequence
Stratigraphy of European BAsins, SEPM Special PUblications No 60, p.
233-244, p. 242
200-600 m is a range of 650-1950 feet. the center of that range is in the
neighborhood of 1300 feet deep
glenn
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