BULL. GEOL. SOC. AM 



VOL. 11, 1899, PL. 43 



Figure 1. — Thomsonite of Type I 



Partly covered by Thomsonite of Type Ilia. Chabazite underlies the whole. Two- 

 thirds natural size 



Figure 2. — Thomsonite of Type II 

 Underlain by Thomsonite of Type I. One-half natural size 



THOMSONITE OF TYPES I AND II 



