Other than my spelling, what do you imagine that I'm mixed up about? The Coelacanth being used as an index fossil? Or the concept of index fossils?
Other than my spelling, what do you imagine that I'm mixed up about?
Where would you like us to start?
The Coelacanth being used as an index fossil? Or the concept of index fossils?
Neither. You're mixed up about how they're used and why the process is effective, apparently, because you're under the mistaken impression that finding modern descendants of index fossils would somehow invalidate the identification of strata by index fossils.