296 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



CONCLUSIONS 



The conclusions of Rothpletz's reconnaissance in the vicinity of 

 Helena, Montana, are essentially as stated below, followed by my own 

 conclusions on the results announced by him, the numbering being 

 the same for each set of conclusions. 



/. {Rothplcta) That the upper limestone No. 6 of his section 

 (p. 281) of Mount Helena is a part of the pre-Cambrian " Helena " 

 limestone of Walcott. 



/. {Walcott) The Rothpletz limestone No. 6 is the Aliddle Cam- 

 brian, Pilgrim limestone of Weed (p. 281). 



2. {KoiJiplctz) That No. 5 of his section, the Capitol Creek shale 

 (p. 281), is a bed of shale interbedded in the "Helena" limestone 

 of Walcott. 



2. {Walcott) The Rothpletz shale No. 5 is the Middle Cambrian, 

 Park shale of Weed (p. 281) that carries a typical Middle Cam- 

 brian fauna at Helena and vicinity. 



5. {Rothpletz) That No. 4 of his section (p. 281). the limestone 

 beneath the Capitol Creek shale, is the lower portion of the Helena 

 limestone of W^alcott. 



?. {Walcott) The Rothpletz limestone No. 4 is the Middle Cam- 

 brian, Meagher limestone of Weed (p. 281) which has been recog- 

 nized around the Big Belt and Little Belt Mountains. 



-/. {Rothpletz) That No. 3 of his section (p. 281), the shales 

 beneath the lower limestone, is the pre-Cambrian Empire shale of 

 Walcott. 



4. {Walcott) The Rothpletz shale No. 3 is the Middle Cambrian. 

 Wolsey shale of W'eed (p. 281 ) which carries a typical Middle Cam- 

 brian fauna. 



^. {Rothpletz) That Xo. 2 of his section (p. 281), the brownish 

 weathering quartzite beneath the Empire shale of Conclusion 4, may 

 be the upper part of No. i ( = pre-Caml)rian Spokane shale of Wal- 

 cott). He qualifies this by saying, " A comparison for No. 2 with 

 the Lower Cambrian Flathead quartzite would be nearer." 



5. (JTalcott) The Rothpletz quartzite No. 2 is the Middle Cam- 

 brian basal b'lathead quartzite of Weed (p. 281) that is super- 

 jacent to the Belt formations about Helena, the Spokane Hills, and 

 around the Big Belt, Little Belt and in the Big Snowy Mountains. 



