| 31. | The resulting elevated levels of carbon burial would account for the black shale deposition in the ocean basins.
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| 32. | The Marmontains Formation can be correlated with the Valzeina Formation of Graub�nden and black shales in the Engadine.
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| 33. | The formation of the foreland basin through rapid subsidence initiated a transgressive sequences that deposited basinal black shales.
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| 34. | In May 1943, as one of the shafts was being deepened, the miners encountered bands of soft, black shale.
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| 35. | Generally, black shale receives its influx of carbon from algae, which decays and forms an ooze known as sapropel.
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| 36. | A trio of teen-agers excavated it from the black shale of an abandoned New Jersey quarry 39 years ago.
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| 37. | The Ellsworth is composed of a lower part of interbedded brownish-black shale and an upper part of greenish-gray shale.
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| 38. | In order for a shale to be a black shale, it must contain more than one percent organic carbon.
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| 39. | In the upper part, intercalations of black shale with gypsum flakes and abundant pyritic micritical concretions appear, some with ammonites.
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| 40. | The serpentine rock at the head of the Eel River is crushed to a green clay or shining black shales.
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