EXPLANATION FOR POMP BOUNDARY FILE bound.90

This file contains digitized crustal plate boundaries for the world.
The boundaries are NOT complete around each plate, but delineate those
lines where the distinction between plates is clear.

Source: Paleo-Oceanographic Mapping Project (University
    of Texas at Austin)
Data Manager: Lisa Gahagan, (512) 471-0488

Each boundary has a 2 line header, followed by a string of lats, longs,
and pen movements (2 = pen down, or connect to previous point, 3 = pen up,
or start a new line segment).  A lat, long of 99.000, 99.000 signifies
the end of the string for that boundary.  

HEADER LINE 1:
    Reference number for location and source
    Plate boundary number
    Name of boundary

HEADER LINE 2:
    Reference number for plate
    Time of appearance (mya)
    Time of disappearance (mya)* 
    Boundary Type Code:
        FZ = fracture zone
        RI = ridge
        SS = strike-slip
        TF = transform fault
        TR = trench
    Magnetic anomaly code*
    Plate code*
    Color code for plotting*
    
* signifies these codes are inappropriate for this data set (POMP
maintains other files of past isochrons in this format)