A stratigraphic name can be a chronostratigraphic unit, such as "Katian", a name of a bio-zone such as " Diplograptus foliaceus graptolite-zone", or a lithostratigraphic unit, such as "Dalby Limestone Formation", or "Kinnekulle K-Benthonite Bed", and even an absolute time tag such as "454.62 Ma".