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Hey guys, So I found this and I thought maybe it looked like a turtle flipper? Also, a side question. Is it possible for pigment to still be present in fossil turtle scutes? Thanks for your time and help!

Hey guys, I dont really know what this could be, maybe just rock, but the color, shape, texture made me think twice - specifically the curved smooth bottom, sharp sides that curve strangely and just the shape in general. At first glance i thought it looked like a meteorite because of the flow-line'esque texture it has in some parts and the bottom side was smooth with little holes with some thumb print 'ish indents, and its darn heavy. But then it also reminded me of some marine mammal and large reptile fossil bones I've seen on here while perusing so I thought I'd ask. Also because of some other things I have found, which I want to ask about as well but dont want to spam all at once. Actually I'll post two of the other things too Found in Menlo Park, California about ~12" inches in ground, maybe slightly deeper. Menlo Park is considered Pleistocene/Holocene alluvial but there have been cretaceous foraminifers found in the towns surrounding Menlo Park. And then there was the paleoparadoxia found during the excavation of the Stanford Linear Accelerator as well, which is about a mile away from me, and they are from the Miocene I believe. Also after reading the USGS geological map survey of my area it seems that theres out crops from every time period, mostly due to the gazillion faults in SF bay area. So Im not really sure what I'm living on. Anyways.. The second rock looks like it has a mouth and some teeth which I found interesting. The third looks like a shell on the one curved end, but also like a saurapelta armor plate I've seen in photos before. Appreciate any thoughts, and if it is rock, do you know what kind? Thanks for your time and feedback!

Hey guys and gals, While this isn't a fossil, I was wondering, if any of you had the time, could you help me ID this bone, as many of you are good at that sort of thing and I am clueless. Found in Menlo Park, CA. Still doing yard work when I have time and I came across this. Thanks for your help in advance! Hope everyones having a good day.

Hey guys, Now that the weather has warmed up a bit Ive been back doing some yard work... and that means I get to bother you all with some more questions about what I've found !! So while doing some digging to run some irrigation lines, Ive been finding a lot of what appears to be clam and/or mussel shells?? I have naively posted in the past about what I thought might be possible coprolites (basically I saw a photo or two on google and connected them). But now after some time and some further research, I think some of the rocks that I posted before were actually large clams or mussels as well. The weird thing about some of these rocks though is that they seem to have retained some color. For example it appears that the body coming out of the shell of the first rock I'll post still has its colors? Like it was preserved somehow before turning into a rock? Everything tells me this is impossible... However if they are just conglomerates like others have said in the past, why would the "body" part of this rock be uniquely colored from the rest of the "shell". Is it just coincidence that this conglomerate rock has the clearly defined shape of a shell, and separate colors and composition for its shell and body? The other rocks I've found that are similar to this one all look kinda the same in that they have layers, almost like they were "folded" or "melted" on to eaechother for lack of a better word. Are there actually ways that animals could be preserved if the conditions were right? I live on mud pretty much, or thick silty mud. Could some combination of salt water, heat, some random chemical reactions, and since they are clams they could easily be packed under the mud, create an environment where it would dry, sort of like jerky lol? If this sounds crazy just let me know lol. Any comments or insight is appreciated! Ill post some others that I think could be fossils as well, the traditional kind. Previously I was told that I wouldn't find any fossils because of my location but currently I'm digging into what seems like a bed of some sort of mollusk. Also theres random sections and chunks of what looks like concrete but its not, its like hardened sandstone /limestone that I have found some interesting rocks in as well. Thanks for your time!