Hi,

When looking at the gastropod genera, the 1:100 ratio looks like just a
predator:prey ratio, since modern representatives of the genera you're
mentioning are (at least partially) molluscivorous.

I personally cannot not see how any further information can be inferred
about the environment from only this ratio (most probably my fault).

Perhaps the bivalve genera present would give more info about the
substrate (this all under the assumption that genera as an environmental
indicator stay representative in time, e.g. a silt-dwelling genus in the
Miocene is still a silt-dwelling genus today, etc.)?

Sincerely, Erick

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