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Showing results for tags 'sedimerntary rock'.
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I really have no idea what this is. Maybe I am missing something obvious. Maybe a nautiloid fragment? It was found in a fossil-rich hard miocene(I think) sand/mud stone. In the that piece of rock were some poorly preserved bivalve and gastropods. Lastly, what would cause those interesting markings on it? The NZ $1 coin is has a diameter of 23mm Thanks!