Analysis of information sources in references of the Wikipedia article "Bitumen" in English language version.
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Bitumen mixed with clay was usually called asphaltum.
{{cite book}}: CS1 maint: numeric names: authors list (link){{cite report}}: Cite uses deprecated parameter |citeseerx= (help){{cite book}}: CS1 maint: publisher location (link){{cite report}}: Cite uses deprecated parameter |citeseerx= (help)Bitumen has been defined by various sources as crude oil with a dynamic viscosity at reservoir conditions of more than 10,000 centipoise. Canadian "bitumen" supply is more loosely accepted as production from the Athabasca, Wabasca, Peace River and Cold Lake oil-sands deposits. The majority of the oil produced from these deposits has an API gravity of between 8° and 12° and a reservoir viscosity of over 10,000 centipoise although small volumes have higher API gravities and lower viscosities.
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