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/usr/share/gmt/x2sys/geoz.def is in gmt-common 5.3.1+dfsg-2.

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#		$Id: geoz.def 12822 2014-01-31 23:39:56Z remko $
#
# Define file for X2SYS processing of ASCII lon,lat,z files
#
# This file applies to plain 3-column ASCII files.
#
#---------------------------------------------------------------------
#ASCII		# The input file is ASCII
#SKIP 1		# The number of header records to skip
#---------------------------------------------------------------------
#name	intype	NaN-proxy?	NaN-proxy	scale	offset	oformat
lon	a	N		0		1	0	%10.5f
lat	a	N		0		1	0	%9.5f
z	a	N		0		1	0	%6.1f