504 WARREN S. SMITH 



granitic bowlders predominate, is O.ooo feet or more thick, and is 

 dynamically disturbed. The Mesozoic closed with a period of se- 

 vere orogenic disturbance, as evidenced by the structural relations 



Fig. i. — Swank arkose >orio#. Conglomeratic fades 



of Tertiary rocks. This unconformity is very marked, because the 

 earliest Tertiary sedimentaries lie at distinct angular unconformity 

 on the pre-Tertiary rocks, a break which is well described by 

 Smith and Calkins in the Snoqualmie area. 1 The pre-Tertiary 



' G. 0. Smith and F. C. Calkins, Folio I'.S.o.S.. too 



