This forum is predominantly American and I think You'd have better luck with local sources re fossil formation in that particular mountain.
Having said that I live in the UK not far from Dorset and what is known as the Jurassic coast. It is very rich is fossils as well, and many people do collect them and they're sold in the local gift shops. As for value it depends on the fossil, they're not diamonds, and a lot are so cheap they're given away as free gifts in comics and the like. Having said that I'm sure if you found some hitherto unknown specimen of something it might be worth a tidy sum
I'm not a Geologist, and I'm sure others more qualified will be along to give better advice.