I want to know the answer to the following question:
What did the Alberta bitumen mines begin as?
All the background I'm provided with is that "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 into underground sand deposits left behind by ancient river beds and ocean beaches, thus forming the oil sands.". Is that enough to answer the question?
Answer: no