How many geological periods start with C?

13 of the 90 geological periods in Icillion start with C, for example Cretaceous, Cambrian and Cenozoic.

What is the longest name among geological periods that start with C?

The longest is “Changhsingian” and the shortest is “Carnian”.

Science · lists

13 geological periods start with C, from “Calabrian” to “Cryogenian”. Every one of them counts as an answer in Icillion.

C is the 2nd most common first letter in this list: 13 of the 90 geological periods (14%).
Shortest: “Carnian”. Longest: “Changhsingian”.

How many geological periods start with C?: 13 of the 90 geological periods in Icillion start with C, for example Cretaceous, Cambrian and Cenozoic.
What is the longest name among geological periods that start with C?: The longest is “Changhsingian” and the shortest is “Carnian”.

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