66493
Upper sedimentary layers relate to the period from the Mesozoic to the Cenozoic ( 250 " million years ago to present ) and the lower layers from the Paleozoic to the Mesozoic .
 Mesozoic, Cenozoic, Paleozoic, Mesozoic
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mesozoic, Cenozoic, Paleozoic, Mesozoic