296 



POPULAR SCIENCE MONTHLY 



Marshall Hotel, thrown into Tomales 

 Bay. 



houses in the villages of Manchester and Point Arena, wrecking the 

 magnificent lighthouse of solid masonry on the Point itself. In low 

 ground the rift formed successions of little ponds. On hillsides the 



lower side of the crack fell away 

 like a drivelling lower lip, leaving 

 an open chasm, ten to twenty feet 

 in apparent depth. On level hard 

 ground the soil like the rock below 

 closed with a snap a little tighter 

 than it was before. Line fences 

 were broken and sheered from six- 

 teen to twenty feet. Lines of trees 

 met with similar readjustments. 

 In Mendocino County the horizon- 

 tal displacement is about sixteen 

 feet. In Marin County, where 

 exactly measured, it is sixteen 

 feet and seven inches. Southward it becomes less. In San Mateo 

 County it is six to eight feet, and at the Pajaro Bridge at Chittenden, 

 where the open fault ceases, the western pier was moved northward 

 about eighteen inches. This shifting of position, evident along the 

 line of the crack, seems to have 

 included the whole region, moun- 

 tains and valleys, through which 

 the crack passes. Either the re- 

 gion to the westward with the 

 Santa Cruz Mountains and the 

 mountains called Sobrante de la 

 Punta de los Reves have been 

 stretched out toward the north- 

 ward or else the region on the 

 east side, including most of Cali- 

 fornia, has been correspondingly 

 humped up. It is impossible at 

 present to say which is the fact, 

 perhaps both. The vertical dis- 

 placement is small. To the 

 north of San Francisco the west 

 side has been raised two or three 

 feet. To the southward the 

 slight relative change in eleva- 

 tion — two or three feet — is in favor of the east side. 



The rift left the pastures of Point Arena, passing up Gualala 

 River, always in a straight line, making havoc among the redwood 



Earthquake Crack in Country Road from 

 Olema to Point Reyes. 



