Figure F34. Close-up photograph of volcaniclastic rock composed of angular fragments of cryptocrystalline basalt embedded in a matrix of altered glass in basement Unit 1256D-4a (interval 206-1256D-20R-1, 31-50 cm).

Figure F34. Close-up photograph of volcaniclastic rock composed of angular fragments of cryptocrystalline basalt embedded in a matrix of altered glass in basement Unit 1256D-4a (interval 206-1256D-20R-1, 31-50 cm).