7574
The reddish siltstone rock that caps many ridges and buttes in the Powder River Basin in Wyoming and in western North Dakota is called " porcelanite " , which resembles the coal burning waste " clinker " or volcanic " scoria " .
 Powder River Basin, Wyoming, North Dakota
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Powder River Basin, Wyoming, North Dakota