ibexian造句

• However the Ibexian, named for the Ibex region in western Utah, extends 2.7 . m . y . into the Cambrian taking up more than half of the Trempealeauan.
• The Whiterockian is preceded by the North American Cassinian and Ibexian stages and by the Canadian Series and ICS Arenigian, overlaps with the slightly younger and newer ICS Darriwilian and is followed as originally conceived by the Chazyan of North America.
• In the four part Canadian series, the Cassinian is late upper Canadian, preceded by the Jeffersonian, and is equivalent to the upper Blackhillsian stage of the Ibexian which has been sought to replace the Canadian as the Lower Ordovician in North America.