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Echinoidea source details
Cohen, K.M.; Finney, S.C.; Gibbard, P.L.; Fan, J.-X. (2013; updated). The ICS International Chronostratigraphic Chart. Episodes 36: 199-204.
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Cohen, K.M.; Finney, S.C.; Gibbard, P.L.; Fan, J.-X.
(2013; updated). The ICS International Chronostratigraphic Chart. Episodes 36: 199-204.
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