CTD, I think there's a point above that needs to be clarified.

Index fossil:

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Index fossils (also known as guide fossils or zone fossils) are fossils used to define and identify geologic periods (or faunal stages). They work on the premise that, although different sediments may look different depending on the conditions under which they were laid down, they may include the remains of the same species of fossil. If the species concerned were short-lived (in geological terms, lasting a few hundred thousand years), then it is certain that the sediments in question were deposited within that narrow time period. The shorter the lifespan of a species, the more precisely different sediments can be correlated, and so rapidly evolving types of fossils are particularly valuable.


The foram in question, which you found a link to, is only mentioned as a fossil find -- not as an index fossil. It would not be an appropriate index fossil to use for the Ordovician because its evolutionary lifespan encompasses several other geological ages as well. The link above should make this clear. Hence, the question as to why Woodmorappe would attempt to use it as such.