5ULL. GEOL. SOC. AM. 



VOL. 28, 191G, PL. 22 



FiGniE 1. — Hollow (Jas ruoi'oi) ('\si i\(los]d nv i'kufkct Dolomite Molds 

 From Trenton, near Beloit, Wisconsin 



/- • 





I'Kil !;K ::. I'LRFKC'J- CA[.C1X1C ( ASl S 



The casts are embedded in fine grained dolomite, the white unstained areas of the picture. Dolomite 



nlso fills tlio slid] cnvilios. Xntural sizo. From Trenton; locality uncertain 



CALCITE CASTS 



