| 21. | The source rocks which provide the heavy mineral sands determine the composition of the economic minerals.
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| 22. | The ultimate source rocks may be mafic-ultramafic rocks.
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| 23. | The brown Junggar basin, which are among the richest source rocks for oil in the world.
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| 24. | Depend on properties of Sm-Nd radioactive isotope system can provide age estimation of sedimentary source rocks.
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| 25. | Pennsylvania also has reserves of natural gas from both deeply buried source rocks and coal-bed areas.
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| 26. | These mid-Cretaceous shales also serve as source rock for reservoirs found in Paleogene turbidites and basin fan complexes.
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| 27. | A good source rock has 1 % organic material in it; an outstanding source rock has 5 %.
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| 28. | Some of the most important source rocks come from this stage, including the La Luna and Socuy formations.
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| 29. | Lacustrine deposits have gained more attention recently due to containing valuable source rocks of oil, coal, and uranium.
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| 30. | The proper source rocks have to be buried to the proper depth for the proper length of time.
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