Subject ASC0003tcm

The geological magazine, or, Monthly journal of geology.
Decade 3:v. 4 (1887), Page 17 (1864)
Smithsonian Libraries
BHL Page 30751414

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Fig. 3 John Young FGS Cone-in-Cone Structure geology formation rock shale Clovelly Portledge Mouth Upper Culm strata Culm Measure

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