CAMBRIAN ROCKS IN SOUTHEASTERN CALIFORNIA 473 
Spurr? reports sandstones, limestones, and other rocks containing 
fossils probably of Middle Cambrian age. 
Quartzites and crystalline l'mestones occurring just east of Oro 
Grande station believed to be Cambrian by Hershey? but no fossils 
were found in them. 
t Loc. cit., pp. 155, 165. 
2 American Geologist, Vol XXIX, p 288. 
