| 41. | Historically, this loess belt has underlain some of Germany's richest agricultural regions.
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| 42. | The area is underlain by Conococheague limestone.
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| 43. | Keedysville is underlain by the Tomstown Dolomite, a carbonic rock formation of the Cambrian.
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| 44. | In the Pliocene and Pleistocene it was underlain by the now-smaller Lake Okeechobee.
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| 45. | Most CIDs are underlain by organic-rich clays and / or Miocene aged lignite.
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| 46. | The river flows through areas underlain with bands of Triassic Period sandstone and Mercia Mudstone.
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| 47. | Corney is underlain by Grandiorite of the Eskdale intrusion, intruded during the Ordovician period.
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| 48. | Deming and its surrounding area is underlain by an aquifer of good-quality water.
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| 49. | More moderate slopes are underlain by shale.
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| 50. | The whole area is underlain by Silurian mudstone which was extensively glaciated during the rushes.
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