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Hello all. New to this site but not new to fossils. By no means an expert so always learning. Have hunted here in SW Florida for over 10 years and have also had the great opportunity to hunt the White River formation in NW Nebraska a few times and am hooked. Hope to continue hunting out there if I can find good locations that allow it.

hey guys, I'm back and probably don't have a fossil again haha but one of these days I will! I was wondering if anyone could help me ID this. I have found many rocks that are a similar shape to this. it tends to be difficult for me to tell from online pictures/descriptions, mostly because I’ll see shale and be certain its shale, but then I’ll see a picture of basalt, a random dark colored limestone rock, piece of chert, or even a fossil sloth claw or fossil tooth and then just have no idea because it could be any of the five depending on what photo I’m looking at haha. This is actually a very common problem I am having when trying to identify many different rocks (or possibly fossils) as my interest in fossils, rocks, minerals, and geology has recently grown. Also if anyone has any recommendations for a good intro book on fossils or rocks/minerals I’d love to hear them!! Maybe something more informative/technical than average kids book but not too academic/jargon-heavy/scientific/dry like a research paper would be awesome! Sorry about the link, imgur doesn't limit my upload size and my new iPhones pictures are massive so I have to resize to less than 50% in order to attach here. hope that's ok. there are 3 different rocks in the album, they are labeled. Menlo Park, CA according to the USGS survey of the bay area, I live in the Holocene alluvial section, bordering the Pleistocene alluvial section if that helps at all? found doing yard/landscaping work. its about 5 inches long but that's not exact, I can measure if needed. thanks in advance for any help and input!! https://imgur.com/a/IplRv