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They stopped at Bahía Blanca , and in cliffs near Punta Alta Darwin made a major find of fossil bones of huge extinct mammals beside modern seashells , indicating recent extinction with no signs of change in climate or catastrophe .
 Bahía Blanca, Punta Alta, Darwin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bahía Blanca, Punta Alta, Darwin