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Igneous rock: Obsidian mahogany
The abbreviation cf. stands for the Latin 'confer' and means that the fossil resembles the mentioned species. An example of a coral: Favosites cf. basaltiformis. The fossil belongs within the genus Favosites and resembles the species basaltiformis. This is used to indicate an uncertainty in the identification. When it is completely unknown what species within the Genus it is about, then sp. or indet. is used.
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