They could have a char once a fortnight for a scrub-down and the heavy washing. The Combined Maze May Sinclair In an hour I had landed twelve trout and char, weighing 10Â½ lb. Sport in Vancouver and Newfoundland John Rogers In this light they were considered by the parliament in the 25 char.
The geologic time scale that represents the longest time span is  the eon. It is a unit of time that is equal to a billion years.
A geologic unit is a volume of a certain kind of rock of a given age range. So a sandstone of one age might be colored bright orange, while a sandstone of a different age might be colored pale brown. Many geologic units are given names that relate to where their characteristics are best displayed, or where they were first studied.