BULL. GEOL. SOC. AM. 



VOL. 28, 1916, PL. 23 



SECTION OF DOLOMITE FROM LANCASTER, WISCONSIN 



This section, of natviral size, is across tho hoddins. It was obtained from tlie lower, 

 compact beds of (Jalena formation at ,T. Wri.ulit's <niarr\- nortli of Lancaster. Wisconsin. 

 White, unstained irregular ])atches arc (loloinilc. The calcltic ai-eas are highly fossilif- 

 erous. Ver.y few fossils lie within the dolomite, and these show all stages of destruction 

 through invasion of dolomite crystals. 



