AURIFEROUS GRAVEL MAN IN CALIFORNIA. 427 



3. Mortar. Appears to be a fine-graineil dioritic dyke rock, Imt is too dirty and 



stained to be satisfactorily examined. 



4. Pestle. Fine-grained rock, apparently a crystalline schist. 



4. Mortar. Gray hornblende andesite, a common facies in Neocene breccias. 



5. Mortar. Fine-grained hornblende andesite. 



6. Mortar. Apparently a hornblende andesite, though of somewhat unusual type. 



Porphyritic hornblende is not conspicuous. Apparently phenocrysts of i)lagio- 

 clase and hornblende in gray glassy base. 



7. Cylindrical mortar. Hornblende andesite. 



9. Mortar and pestle. Mortar is pinkish hornblende andesite. Pestle is amphi- 



bolite schist. Shows fibrous structiire and apparently remnants of augite. 

 10. Mortar. Diorite porphyry. Probably dyke rock. 



12. Mortar. Pinkish hornblende aiadesite. 



13. Dish or mealing stone. Gray hornblende andesite. 



14. Dish or mealing stone. Appears to be fine-grained syenite, but jiossihly a diorite. 



Almost certainly a dyke rock. 



15. Dish or mealing stone. A fine-grained pinkish rock containing talc (or some 



equally soft mineral) and a silvery mica. 



16. Mortar and pestle. Mortar, hornblende andesite. Pestle, a porphyritic rock, 



species not recognizable. Not an andesite. 



16. Boat-shaped stone. Compact banded rock, apparently from metamor]iliic Cala- 



veras formation. 

 16a. Boat-shaped stone. Amphibolite schist. 

 161). Boat-shaped stone. Compact rock of doubtful nature. 



17. Large bead. Rusted hornblende andesite (?). 



18. Mortar. Hornblende andesite (?) . Badly weathered. 



19. Crescent-shaped stone. Very fine grained. Apparently an altered dyke rock. 

 20 Cylindrical mortar, 9 inches high. Rather soft talcose rock; probably altered 



dyke rock. 



20a. Small mortar. Diorite with segregation patch. Dyke, or periphery of granodio- 

 rite mass in foothills. 



21. Mortar. Diorite porphyry. May come from periphery of granodiorite mass or 

 from a dyke. Contains a dark segregation patch. 



21a. Grooved jjebble. Fine-grained gray hornl)lende andesite. 



211). Grooved pebble. Fine-grained gray hornblende diorite. Dyke rock. 



21c. Grooved pebble. Fine-grained diorite. Dyke rock. 



23. Mortar. Gray hornblende andesite. 



— . Round stone (found in 1863 at Gold Springs Gulch, Tnohnnne (Vmnty, in aurif- 

 erous gravel of Pliocene age). Fine-grained diorite. Dyke rock. 



Pis. Ill to XI are devoted to the illustration of a number of these 

 objects. The photoji^raphs used, with one exception,. were lent for the 

 purpose ])y Dr. R. E. C. Stearns, of Los Anj^eles, Cal., the orioinal 

 Voy collection numbers being given, as also in the preceding list. The 

 ' )))jccts referred to in th(^ above list form but a small fraction of the nml- 

 iitude of relics reported from the gravels. 



In presenting these objects the original statements that tlicv were 

 found in definite relations with Tertiary strata and Tertiary nuunma- 

 lian remains are allowed to stand, l)ut it shoidd be understood th:it 

 the view of the problems involved taken in this paper requires that 

 such statements should as yet be followed by an interrogation. This 

 interrogation does not raise a question as to the veracity of the finders, 

 l)ut serves to express the feai' that in som(^ way errors of ol)servation 

 or record have been made. 



