50 KEMP'S ORE DEPOSITS. 



The first named is a useful term, although it is not always easy to- 

 distinguish impregnations from others earlier given. Thus, they 

 may be very like the division, disseminated through strata, or dis- 

 seminated through eruptive rock, or, if in metamorphic rock, f ahl- 

 bands. The word is also used to indicate places along a vein 

 where the ore has spread into the walls. The term " chambers,'* 

 or " caves," has found application in the West, and is a useful ad- 

 dition. Bedded veins appear also in Yon Cotta above (No. 6). 

 Phillips seeks to explain the methods of origin in his use of Whit- 

 ney's scheme and clearly feels the importance of emphasizing the 

 genetic principle more strongly. Much of it is implied in the 

 simpler phraseology, however, and the extended sentences lack the 

 incisiveness of the earlier schemes. The arrangement as set forth 

 by Whitney is worthy of high praise, and the scheme is one of 

 the many valuable things in a book that has played a large part in 

 the economic history of the United States. 



1.06.10. ~D. Schemes Largely Based on Origin. 



(13) 

 J. Grimm, Lagerstatten, 1869. 



I. Gemengtheile oder grossere Einschliisse in den 

 Gebirgsgesteinen. Einsprengung, Impregnation. 

 (Essential component minerals and inclusions in 

 country rock. Impregnations.) 



(a) Urspriingliche Einsprengung. (Original with 



the inclosing rock.) 



(b) Von anderen Lagerstatten weggef iihrte Bruch- 



theile, etc. (Fragments brought from a dis- 

 tance. Placers, ore-bearing boulders. Brec- 

 cias.) 



II. Untergeordnete Gebirgsglieder oder besondere Lager- 

 statten. (Subordinate terranes or special forms 

 of Deposits.) 



(a) Plattenformige Massen. (Tabular masses.) 



1. Lager oder Flotze. Bodensatzbildung. 



(Beds, strata.) 



2. Gange, Kliifte, Gangtrummer, etc. (Veins 



of varying sizes.) 



3. Plattenformige Erz-ausscheidungen und 



Anhaufungen. (Segregated veins.) 



(b) Stocke und regellos gestaltete Massen. (Stocks 



and irregular masses.) 



