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古丈期
5–497百万年前。 Briggs, D.E.G.; Collins, D., The Arthropod Alalcomenaeus cambricus Simonetta, from the Middle Cambrian Burgess Shale of British
5–500.5百万年前。 Briggs, D.E.G.; Collins, D., The Arthropod Alalcomenaeus cambricus Simonetta, from the Middle Cambrian Burgess Shale of British
乌溜期
[2019-05-08]. （原始内容存档于2020-02-28）. Briggs, D.E.G.; Collins, D., The Arthropod Alalcomenaeus cambricus Simonetta, from the Middle Cambrian Burgess Shale of British
寒武纪第四期
[2019-05-08]. （原始内容存档于2020-02-28）. Briggs, D.E.G.; Collins, D., The Arthropod Alalcomenaeus cambricus Simonetta, from the Middle Cambrian Burgess Shale of British
寒武纪第三期
[2019-05-08]. （原始内容存档于2007-11-04）. Briggs, D.E.G.; Collins, D., The Arthropod Alalcomenaeus cambricus Simonetta, from the Middle Cambrian Burgess Shale of British