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Basin Axis. Basin Margin. 100. 80. 60. Broken shell ls. 50. 40. 40. fault. 40. 80. 60. 20. Scallop bed. 20. 20. 60. 20. 40. 0. Cinder bed. 0. Quartz s.s. fault. Mammal bed. Great dirt bed. 0. 40. Subsidence. 20. 0. Durdle Door. Stair Hole. Lulworth Cove.
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Basin Axis Basin Margin 100 80 60 Broken shell ls 50 40 40 fault 40 80 60 20 Scallop bed 20 20 60 20 40 0 Cinder bed 0 Quartz s.s. fault Mammal bed Great dirt bed 0 40 Subsidence 20 0 Durdle Door Stair Hole Lulworth Cove 20 0 Mupe Bay Purbeck 0 Worbarrow Tout 20m Portland Durlston Bay