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Please help me identify this rock and an introduction



Hello IGS Members,
Let me begin by saying I am a brand new member here and am very excited to be here. I am going to see what you all have to say about this little brown interesting stone I found a couple of months ago here in CO.
I found this in Clear Creek and I have been trying to identify it for awhile now. I’m leaning towards a fossilized bird or reptile egg. I was initially thinking it might be a pyrite concretion of some sort, but I don’t think that’s the case now.