432 B. WILLIS — SOME COAST MIGRATIONS, CALIFORNIA 



b-c-d. Emergence; erosion which sufficed to lay bare metamorphic schists and 

 granite of the Coast complex, so that these rocks entered the basal con- 

 glomerate of the Franciscan series at the time d. 



d-e. Submergence; sedimentation corresponding to the Franciscan series, of late 

 Juratrias or early Cretaceous date ; closed by movements which gave rise 

 to deformation of the Franciscan series in the zone of deformation by 

 fracture. 



e-f-g-h. Emergence; erosion following the initial uplift and probably other move- 

 ments corresponding to unconformities among Cretaceous and Eocene 

 formations of adjacent sections. 



//-/. Submergence; sedimentation corresponding to the formations of Miocene (?) 

 and possibly later Miocene (Monterey) time, limited at an indeterminate 

 date by the initial rise of the present Santa Lucia range, but continued 

 into Pliocene time in the adjacent eastern district. 



/-/'. Emergence; corresponding to the initial rise of the Santa Lucia range; 

 approximately 1,800 feet. 



j-k-l. Pause in uplift, resulting in erosion to general lowland with monadnocks. 



l-ui-n. Renewed uplift (1,200 feet ±) and erosion, with development of high level 

 terraces, now 2,000 feet ± above sea at Gamboa point. 



n-o. Later elevation of the Santa Lucia range, a rise of 2,000 feet, probably asso- 

 ciated with development of coastal fault scarp. This later movement 

 may have been complicated by or succeeded by oscillations of level of 

 several hundred feet, apparently recorded in the San Luis Obispo district. 



Path of Coast complex stratum. — At the right of the diagram at o is represented a 

 point near Cone peak, 5,000 feet above sea, where there is an outcrop of marble 

 and gneisses of the Coast complex. The lower curve represents the path of these 

 sediments from their place of deposition in the Paleozoic (?) sea across the zones of 

 the earth's crust to their present position. 



a-p. Subsidence; which carried the strata of the Coast complex down to the zone 

 of deformation by flow. 



p-q. Uplift, accompanied by movements of compression and granite intrusion. 



<j-r. Subsidence, corresponding to burial beneath Franciscan sediments. 



r-g-h. Uplift accompanied by deformation of Franciscan formation and volcanic 

 activity, probably distributed in several episodes with quiescent inter- 

 vals. At g the particular strata of the Coast complex which now out- 

 crop at o are assumed to be exposed and to form part of the surface upon 

 which the Miocene (?) sediments were deposited. 



