14" x 1.5"
Says: Center of glass and gold framed by Earth crust slurry melted framed by "ALL" layers mixed from north, south, east, west framed by 9°45' south 175°45'west & "Snowball Earth". (Amazing roll of the Snow-Ball earth material as it encroaches but does not overflow onto the writing.)
The back is glazed with the same Lau Basin material whose coordinates are specified on the front.
There is a photo of the piece before firing that shows the center is red glass that turned green in the firing.