that time.

Time and duration

Recent estimates (ICS and Cosuna) place the beginning of Gasconadian, and Ordovician, anywhere from about 488 to 500 million years ago, with a duration ranging from 9.7 to 10 million years respectively putting the end about 464 m.y.a. Both give estimates of over half the Early Ordovician. 60 percent according to the ICS, 2/3 according to Cosuna.

Strata

The Gasconadian (Tremadocian) is represented in southern New

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