Skip to content Skip to navigation

Article: The trilobite Lejopyge Hawle and Corda and the middle–upper Cambrian boundary

Publication: Palaeontology
Volume: 18
Part: 3
Publication Date: August 1975
Page(s): 527 550
Author(s): B. Daily and J. B. Jago
Addition Information

How to Cite

DAILY, B., JAGO, J. B. 1975. The trilobite Lejopyge Hawle and Corda and the middle–upper Cambrian boundary. Palaeontology18, 3, 527–550.

Online Version Hosted By

The Palaeontological Association (Free Access)


The species and subspecies of the late middle Cambrian agnostid trilobite Lejopyge are reviewed. Lejopyge cos Opik is shown to be a junior synonym of Lejopyge laevigata armata. In Sweden the middle-upper Cambrian boundary is placed at the boundary between the Lejopyge laevigata and Agnostuspisiformis Zones. The reassignment of L. cos to L. l. armata and other criteria suggest that this boundary in Australia should be drawn within the Mindyallan Cyclagnostus quasivespa Zone between the L. cos and Blackwelderia sabulosa faunas.It is suggested that the middle-upper Cambrian boundary in North America be placed well up into the Cedaria Zone; in China it is at some as yet undefined position within the Blackwelderia sinensis Zone; on the Siberian Platform it should be placed between the zones of Lejopyge laevigata armata-Lomsucaspis alta and Agnostus pisiformis-'Homagnostus fecundus'; and in north-west Siberia between the zones of Maiaspis spinosa-Oidalagnostus trispinifer and Acrocephalella granulosa-Koldiniella prolixa.
PalAss Go! URL: | Twitter: Share on Twitter | Facebook: Share on Facebook | Google+: Share on Google+