This directory contains these files:

seabed_lithology_v1.nc – a COARDS-compliant GMT short integer netcdf file (GMT format #16) with 0.1 deg resolution
eabed_lithology_v1.xyz.zip – a compressed 3-column ascii file with lon, lat, and value (see list below)
seabed_lithology_v1.jpg – a jpg image of the seabed lithology grid
seabed_lithology.cpt – a color pallette file to plot the netcdf file using software like the Generic Mapping Tools (GMT)
seabed_lithology_v1.kml – a Google Earth kml file of the seabed lithology grid

The lithologies in the netcdf and xyz file are coded by integers as follows:

1	Gravel and coarser
2	Sand
3	Silt
4	Clay
5	Calcareous ooze
6	Radiolarian ooze
7	Diatom ooze
8	Sponge spicules
9	Mixed calcareous/siliceous ooze
10	Shells and coral fragments
11	Ash and volcanic sand/gravel
12	Siliceous mud
13	Fine-grained calcareous sediment

The netcdf file can be easily imported into ArcGIS.  See here for an ArcGIS netcdf tutorial:

http://help.arcgis.com/en/arcgisdesktop/10.0/pdf/netcdf-tutorial.pdf

The netcdf file can also easily be viewed using the panoply software:
http://www.giss.nasa.gov/tools/panoply/

The reference for these data is:

A. Dutkiewicz, R. D. Müller, S. O’Callaghan and H. Jónasson, 2015, Census of seafloor sediments in the world’s ocean basins, Geology, published online 5 Aug 2015.

Link to open-access paper:  http://geology.gsapubs.org/content/43/9/795.full
Link to supplementary information: ftp://rock.geosociety.org/pub/reposit/2015/2015271.pdf

Link to interactive seafloor globe that can be viewed on any browser on smartphones, tablets or computers here
http://portal.gplates.org/#SEAFLOOR