I figured I'd want to ask fossil-related stuff, but I'm not sure if this would be within the purview of this SE site. Can I ask questions about, say, dinosaurs or pre-Holocene mammals?
3 Answers
In private beta and early public, I'd be fairly liberal with scope. They aren't clearly off-topic, so there's no real reason to actively exclude them. If they draw more expert eyes to the site, all the better.
I cannot see how paleontology would not fall under the scope of biology unless the question dealt narrowly with a methodology that might be better for another site (e.g., radioisotope dating -> physics or specific statistical models -> stats)
It depends
It really depends on what you are asking. A question about dinosaur anatomy, mammoth embryology, or hominid evolution would fit pretty solidly in biology.
A question about carbon-dating methods, fossil preservation, or fossil bearing formations in would be pretty firmly in geology, and not biology.
Paleontology is a science that ignores our flawed attempts to classify science into discrete categories.