Re: geological periods

[Dinogeorge@aol.com]

In a message dated 96-01-24 06:59:04 EST, Thomas_R_HOLTZ@umail.umd.edu (th81)
writes:

>For future reference, the important subdivisions for dinosaur workers are
>the Lower (Early), Middle, and Upper (Late) Triassic, the Lower (Early),
>Middle, and Upper (Late) Jurassic, and the Lower (Early) and Upper (Late)
>Cretaceous. 

Also for future reference: use the terms Upper and Lower when talking about
stratigraphy, Early and Late when talking about the epochs when events took
place. Thus, a fossil found in Upper Jurassic rocks represents an organism
that flourished during Late Jurassic time.