50 



WESTERN 



Rogue River. 



Elevation 1,025 f( 

 Seattle 492 miles, 



■ormerly called Woodvillc) are fields of com and 

 t and young orchards. Nearly opposite milepost 



moil 



Creek, whose erravels 



worked for gold. 



At milepost 458, in the outskirts of Gold Hill, there are a lime- 

 stone quarry and a cement plant. The limestone is a lenslike mass 



in a belt of slate more than a mile wide, which may 

 Gold Hill. • be traced to the southwest for a long distance and 



Elevation i,ios feet, coutaius Humerous similar lenses of limestone. Fos- 



seTme 499^iSies. ^^^^ ^^^ ^^^^ ^ ^^^^^ limestoue, but those found suggest 



Carboniferous age. Other limestone lenses, farther 

 west in the area of Paleozoic rocks and not exposed on the railroad, 

 contain fossils of Devonian age. Therefore the Paleozoic rocks of 

 this region are in part Devonian and perhaps in part Carboniferous. 

 Rogue River is crossed just beyond Gold Hill, and the river bed 

 affords a near view of some of the greenstone^ which at this place is 

 clearly made up of fragments of volcanic rock. The greenstones 

 associated with the slates and limestones are m fact old Invns. r»nTtlv 



md partly blowoi out m fragments from volcanoes 

 Paleozoic time. These lavas, origmally black or 

 gray, have become greenish throujjh the slow changes of a2-e. As 



m 



will be seen later, these Paleozoic slates, limestones, and 

 make up much of the Klamath Mountains. 



WV.^ V^X ..VW 



crossmor 



named. This hill 



,,v..v^ .v^u ci./^*,. o^-a, it.vt5i, uuiisiMta oi greenstone ana serpen! 



) which has been intruded some granodiorite that now forms 



top. Small ''pockets'' of rich gold ore were foimd here in e 

 days. 



hU 



mileposts 



gra 



ined 



dark rock composed chiefly of the mineral pyroxene (an iron- 

 magnesium siHcate) and called pyroxenite. This is an imeous 



rock and was probably very 



tune 



from 



Table Rock (PL XV, .4), named from the flat black capping of basalt, 



times 



m 



The lava 



Luv^eu over comparatively sott beds of shale, sandstone, and 

 :lomerate of Oetaceous and Tertiary age. Afterward erosioi 

 hrough the lava m places and attacked thp ^nft^r m^Vu i.^A^^r^ 



remains 



muc 



Beyond Table Rock the country opens out into that part of the 



River valley is especially applied. 



vallej 



osrue 



