A Global Boundary Stratotype Section and Point, abbreviated GSSP, is an internationally agreed upon reference point on a stratigraphic section which defines the lower boundary of a stage on the geologic time scale. The effort to define GSSPs is conducted by the International Commission on Stratigraphy, a part of the International Union of Geological Sciences. Most, but not all, GSSPs are based on paleontological changes. Hence GSSPs are usually described in terms of transitions between different faunal stages, though far more faunal stages have been described than GSSPs. The GSSP definition effort commenced in 1977. As of 2012, 64 of the 101 stages that need a GSSP have been formally defined.
A geologic section has to fulfill a set of criteria to be adapted as a GSSP by the ICS. The following list summarizes the criteria:
I lived my life on a razor blade
Never found escape in my empty shade
Till came one day when the c.i.a
Said we need you bad down in leningrad
I took my life of a legal alien
A "bolivian dancer" that's what i was
And I knew I found my aim
Just telephone mama
Just living on a poison pill
Just telephone mama
A robot dressed to kill
Telephone mama
That's all I kept in mind
Just telephone mama
The rest is left behind
I met freulein in a french caf?
Just a cigarette and "les jeux sont faits"
Till came one night when she was in sight
Through the bathroom door saw her seek for more
I took my colt and I pointed at her eyes
A sentimental cancer that's what it was
And I knew I lost my prize
Just telephone mama
Just living on a poison pill
Just telephone mama
A robot dressed to kill
Telephone mama
That's all I kept in mind
Just telephone mama
The rest is left behind
She looked at me god she was so sweet
She knelt to my feet said she had to cheat
Cause she lived her life on the sharpest knife
And the k.g.b never let her breathe
I took her hand we decided to go far
The naivest "dancer" that's what I was
And two men approached the car
Just telephone mama
Just living on a poison pill
Just telephone mama
A robot dressed to kill
Telephone mama
That's all I kept in mind
Just telephone mama