All these terms are unofficial and used for
convenience, not like the metric terms, like
meter, decimeter, centimeter, millimeter, etc.,
that are "official."
mya is also a bit confusing since the SI unit for year is "a"; mya is more
formally written "Ma ago"; kyr is formally written "ka".
Chris
*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
----- Original Message -----
From: "Sterling K. Webb" <[email protected]>
To: "Shawn Alan" <[email protected]>;
<[email protected]>
Sent: Monday, March 22, 2010 10:27 PM
Subject: Re: [meteorite-list] Question about terrestrial age of 4.4 kyr
Hi, Shawn,
The abbreviation "kyr" stands for "kiloyear" or
units of 1,000 years. 4.4 kyr = 4,4000 years.
Slightly different, "mya" means "million years
ago." The term "aeon" or "eon" is often used
to mean a stretch of one billion years.
All these terms are unofficial and used for
convenience, not like the metric terms, like
meter, decimeter, centimeter, millimeter, etc.,
that are "official."
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