Yeah, gravel does actually fit all right? The ways, in particular what is called forest street in CH are all well suitable for bicycles and mostly fit in the description "small pieces of gravel". Fine gravel is "used to specify fine loose gravel ... unsuitable for road bicycles" as they would sink in. I only remember one path in CH that would really fit into this. I've been there too numerous times and I saw all pretty solid ways...

btw I think I haven't really changed compacted recently, I would only do that right there in the field but I see surfaces with a thin layer of loose gravel more frequently than completely solid compacted surfaces as shown in the tag examples, all rather close to asphalt.