#stratigraphic units table
fields:

1	name	name of the stratigraphic unit, ID
2	base		name of the lower stratigraphic boundary
3	top		name of the upper stratigraphic boundary
4	region	where the unit is defined		
5	statute	e.g., Stage, Biozone	
6	type		e.g, chronostratigraphic, lithostratigraphic, conodont