Oslo-Gebiet  -  Vulkanite  -  Rhombenporphyr RP3

RP3a: "The overlying lava flow RP3a is a most conspicious type. It carries very abundant and large crystals, the largest seen in any rhomb porphyry of the Krogskogen district. It is only about 10 m thick and is overlain by a bed of coarse conglomeratic sandstone..." (Holtedahl & Dons 1966, S. 77)
 
  1 
Rhombenporphyr
    RP 3a Krogskogen,
   leg. K.-D. Meyer 1966,
   Geozentrum Hannover 

      
 
  2 
Rhombenporphyr
Rhombenporphyr
     RP 3a  Krogskogen,
    leg. K.-D. Meyer 1966,
    Geozentrum Hannover
 
    3  


    RP 3a Krogskogen,
   Sgl. A. P. Meyer 1964
    
    4  
RP3b:
"The suceeding lava flow RP3b is a very typical rhomb porphyry in that the huge phenocrysts are very sharp-edged and many good rhombic sections are easily seen..." (Holtedahl & Dons 1966, S. 77)
   
 
   











    RP 3b  Krogskogen,
   leg. K.-D. Meyer 1966,
   Geozentrum Hannover
 
Rhombenporphyr  
  








   RP 3b Krogskogen,
   leg. K.-D. Meyer 1966,
   Geozentrum Hannover
 
 
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