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The first 2 pics im curious about the line curling through the stone. How that could have formed. The middle pics im wondering if the are horn coral or some type of cephalopods. Im assuming coral but the limestone picture made me think Kionoceras. Last 2 pics its hard to see but there’s these odd “slick” looking spots that almost seem like a thin shell/brachiopod remnant or coral maybe. Im sure it’s just part of the rock but curious to know what or how that can occur. Thanks everyone for your help.