Stockdale: Stylolites 



63 



partially penetrated, by small columns (see Figs. 28 and 29). 

 Polished surfaces of the Tennessee marble often offer splen- 

 did examples of this (see Fig. 30). Many specimens of fos- 

 sils which have been penetrated by stylolites are found in the 

 Columbus limestone of Ohio. One of the most striking ex- 



FiG. 30. — Large shells (shaded portions) penetrated by stylo- 

 lites. Specimen is from a polished slab of Tennessee mar- 

 ble in the Monroe County State Bank, Bloomington, Ind. 

 Three-fourths natural size. 



Fig. 31. — Diagram of a stromatoporoid into which a series 

 of stylolites have penetrated. Note that the fossil struc- 

 ture has been actually removed where the upward-pointing 

 columns occur. From a specimen in the Geological ^lu- 

 seum, Ohio State University. About one-third natural 

 size. 



