Lot of Beautiful & Interesting Fossils from the Deserts of the Southwest US

I partially, took after my Grandfather, who had been a geologist, in my love for minerals & gemstones. It was only, later in my life, that I developed an appreciation for fossils & their ages, but I still really don't know much about them. My lack of knowledge could very well be your gain! I can't really tell you much about this lot, other than there is a piece of fossilized coral & a fossilized clam! I'm wondering if the 2 small pieces in the last picture are possibly dinosaurs bones? My grandfather found the majority of his prized collection in & around Wyoming, Arizona, & California, as he was working in those states, at that time. Needing to do some downsizing, I'm trying to thin out some of my collectables, including some of these incredible fossils! I plan on listing some more fossils, along with some of my rocks & minerals. Feel free to ask me any questions.