57946
The third is the early Pennsylvanian Pottsville Formation , which is a gray conglomerate that may contain sandstone , siltstone , and shale , as well as anthracite coal .
 Pennsylvanian, Pottsville Formation
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pennsylvanian, Pottsville Formation