Geological period (3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">geological period</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for era that I've seen before include "Period of alteration" , "Cycle" , "quite some time" , "8" , "Important historical period" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">geological period</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eon that I've seen before include "Age, epoch" , "In time, long division" , "billion years" , "thousand million years" , "Very long period (US and technical spelling)" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">geological period</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that Jurassic is a geological period)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for jurassic that I've seen before include "Film about dinosaurs" , "Age of dinosaurs" , "remote age" , "'... Park', novel/film about dinosaurs" , "period in past" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">geological period</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for epoch that I've seen before include "Geological time period" , "Period, era" , "Historical era" , "Age, time span" , "Major division or period of history" .)
(Other definitions for pleistocene that I've seen before include "denoting an ancient epoch" , "When people first were seen" , "Era when humans emerged" .)