Cambrian Series 2 (1 gen 521000000 anni a. C. – 1 gen 506500000 anni a. C.)
Descrizione:
Cambrian Series 2 is the unnamed 2nd series of the Cambrian. It lies above the Terreneuvian series and below the Miaolingian. Series 2 has not been formally defined by the International Commission on Stratigraphy, lacking a precise lower boundary and subdivision into stages. The proposed lower boundary is the first appearance of trilobites which is estimated to be around 521 million years ago.Aggiunto al nastro di tempo:
Data:
1 gen 521000000 anni a. C.
1 gen 506500000 anni a. C.
~ 5883516 years