Serpukhovian
The Serpukhovian is in the ICS geologic timescale the uppermost stage or youngest age of the Mississippian , the lower subsystem of the Carboniferous . 
<triplet> Serpukhovian <subj> stage <obj> instance of <subj> age <obj> instance of <subj> Mississippian <obj> part of <triplet> geologic timescale <subj> ICS <obj> standards body <triplet> stage <subj> age <obj> different from <triplet> age <subj> stage <obj> different from <triplet> Mississippian <subj> Serpukhovian <obj> has part <subj> geologic timescale <obj> instance of <subj> Carboniferous <obj> part of <triplet> Carboniferous <subj> Mississippian <obj> has part <subj> subsystem <obj> instance of