10408
Due to pressure from the rising of the Rocky Mountains in southwestern Alberta , 80 to 55 million years ago , the oil was driven northeast hundreds of kilometres and trapped into underground sand deposits left behind by ancient river beds and ocean beaches , thus forming the oil sands .
 Rocky Mountains, Alberta
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rocky Mountains, Alberta