Earth Collections: Precambrian and Cambrian database

The geological timescale

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Species Name


Taxonomic Group





Type of Specimen


Note: specimens of Cambrian age are prefixed by the letter A, while those of Precambrian age are prefixed by the letter A with an acute accent (). Specimens of uncertain age, from around the level of the Precambrian-Cambrian boundary, have been treated for cataloguing purposes as belonging to the Cambrian.

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