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Another natural landmark near the city , the Alibates Flint Quarries National Monument is located north of Amarillo .
 Alibates Flint Quarries National Monument, Amarillo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Alibates Flint Quarries National Monument, Amarillo