29(i N. B. Junner : Igneous Pebbles. 



pebbles collected. Pel)ble8 of hornblende gneiss, quartzite. lime- 

 stone, slate, sandstone and chert are also present in the con- 

 glomerate. 



EXPLANATION OF PLATE. 



Plate II. 



Fig. L — Microphotograph of hornblende diabase pebble. No. 

 W2, showing two successive outgrowths from an idio- 

 morphic felspar phenocryst. Ordinary light x 25. 



Fig. 2. — Microphotograph of spherulitic diabase. No. W6. 

 Ordinary liglit x 25. 



