| 31. | Some dolerite dykes have a porphyry centre.
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| 32. | Most lava flows of this volcanism phase are thick and are associated with dolerite sills.
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| 33. | Dolerite intrusive igneous rock granophyre, known as Ercallite forms the northeastern shoulder of the Ercall.
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| 34. | The dolerite can be seen as a building stone in the older cottages around Rowley Regis.
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| 35. | There is a substantial Dolerite quarry at Flagstaff Gully producing Blue Metal gravel for road surfaces.
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| 36. | The rock is a thick gabbroic-dolerite laccolith, which is a source of roadstone.
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| 37. | Dolerite is composed of an intrusive volcanic rock of plagioclase feldspar that is harder than granite.
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| 38. | The Rowley dolerite is an intrusion of late Carboniferous age in the form of a lopolith.
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| 39. | It has formed on Jurassic dolerite sill, which has intruded in Devonian-Triassic sandstone.
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| 40. | The dykes included a swarm of dolerite dykes, also lamprophyre, feldspar porphyry and aplite.
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