GIVE "P"s A CHANCE
'(<a href="http://www.j-archive.com/media/2008-04-23_J_12.jpg" target="_blank">Kelly  of the Clue Crew gives the clue from Carlsbad Caverns National Park, New Mexico.</a>) The fossils in Carlsbad Caverns include sponges, snails & <a href="http://www.j-archive.com/media/2008-04-23_J_12a.jpg" target="_blank">trilobites</a>, all from the Permian period, the tail end of this era whose name means "ancient life"'
Paleozoic