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radiolarian ooze was sedimented here over a time span of 15 million years into the lower ordovician.
Über einen zeitraum von 15 millionen jahren wurde hier radiolarienschlick bis ins unterordoviz hinein sedimentiert.
140 "co2 was higher in the late ordovician" the sun was much cooler during the ordovician.
140 "co2 was higher in the late ordovician" the sun was much cooler during the ordovician.
the ordovician-silurian extinction occurred at the transition to one of the largest ice ages in the last 600myr.
the ordovician-silurian extinction occurred at the transition to one of the largest ice ages in the last 600myr.
romano & henry (1982) the trilobite genus eoharpes from the ordovician of brittany and portugal.
romano & henry (1982) the trilobite genus eoharpes from the ordovician of brittany and portugal.