I've downloaded calcium and magnesium contents dataset from this collection of geostatistical dataset and I would like to do some analysis with the Geostatistical Analyst in ArcGIS for Desktop. The problem is that there is no definition of the reference system of the coordinates of the data.
There are only two columns called 'east' and 'north' and in the documentation it just reads "east-west (north-south) coordinates, in meters". I also know that data should represent samples taken North of Rio De Janeiro, beside the Rio Paraíba do Sul (Campos dos Goytacazes) (reference).
Coordinates look like (first lines shown below):
east north5710 48295727 48755745 49225764 49695781 50155799 50625817 51095837 51615873 5254