| 41. | The Angara flows in latitudinal direction here, cutting through Cambrian and Ordovician sedimentary massif interspersed with diabase intrusions.
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| 42. | The more resistant diabase dikes and sills remained, while the softer shales were bulldozed away by the glaciers.
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| 43. | These Jotnian xenoliths are interpreted as having been part of a conglomerate that was disintegrated by the diabase magma.
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| 44. | However, some of the water is trapped by the impermeable diabase dikes, which act as a hydrologic barrier.
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| 45. | It is built on a sheer cliff eroded by wave action from a diabase mercury which allows near frictionless operation.
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| 46. | To the north, east and south is a complex of Pennsylvanian age argillite, chert, diabase and greywacke.
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| 47. | The north face of Mount McKay shows evidence that below this cap is another thick sill of very hard diabase.
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| 48. | The igneous intrusion that produced these diabase dikes also replaced limestone or marble in the surrounding rock with iron ores.
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| 49. | Sculptors obtained a block of black diabase for the pedestal of the Marine Corps War Memorial from quarries in L�nsboda.
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| 50. | Many of the grabens have prominent signs of igneous activity, with diabase intrusions and basalt flows being quite common.
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