As part of the Article Guidance work (T396029), outlines can be defined for specific article types based on Wikidata items. Normally the Wikidata hierarchy is followed, and it is possible to define a general outline for "museums" and a specific one that applies only to "art museums".
However, as reported by an editor, the outline created in the test instance for "Fossil' is not used when starting an article about a fossil such as "Trilobita" (Q17170) despite that it is an instance of "fossil taxon (Q23038290) which is the Wikidata item attached to the "Fossil" outline. Instead, the more general "animal" outline is used by the system.

This ticket proposes to investigate why that is the case and which options exist to better adjust the system to pick the most specific outline.