So that people can vote on it, I'll go with an answer:
I do think that paleontology is mainly on-topic here but that the openly biological aspect of it (such as taxonomy and anatomy, and to some extant, evolutionary biology) should be asked on Biology.
Questions concerning:
- the fossilization process and the sedimentological impact of fossils
- the extent of the fossil record itself
- mass-extinctions and the impact of abiotic processes on biodiversity
- the place of biological organisms in geological cycles (Carbon, phosphorous, oxygen, silica cycles to name a few) and, more generally speaking, the impact of life on Earth
- the applications of paleontology to other fields of the geosciences (biostratigraphy, paleoenvironments, paleoclimatology, paleoceanography)
are very much on-topic here, I believe.