<synset id="n15247518" type="n">
<lex_filenum>28<lex_filenum/>
<word lex_id="3">period<word/>
<word lex_id="0">geological period<word/>
<pointer refs="n15116283">Hypernym<pointer/>
<pointer refs="n15248020">Part holonym<pointer/>
<pointer refs="n15124545 n15125097 n15126361 n15126595 n15126750 n15127165 n15127307 n15127507 n15127729 n15127982 n15128200 n15128363 n15128549">Instance Hyponym<pointer/>
<pointer refs="n15248269">Part meronym<pointer/>
<pointer refs="n15255195">Hyponym<pointer/>
<def>a unit of geological time during which a system of rocks formed<def/>
<example>ganoid fishes swarmed during the earlier geological periods<example/>
<synset/>