Graptolite diversity was greatly reduced during the Sedgwickii Event in the Aeronian. This event has been attested in locations such as today's Canada, Libya as well as in La Chilca Formation of Argentina (then part of Gondwana).
Graptolite diversity was greatly reduced during the Sedgwickii Event in the Aeronian This event has been attested in locations such as today's Canada Libya as well as in La Chilca Formation of Argentina (then part of Gondwana)