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