Figure F26. Photomicrographs showing zircon crystals in amphibole layer (Sample 209-1270D-4R-1 [Piece 7, 33–37 cm]) (field of view = 0.7 mm). A. Plane-polarized light: blue filter; image 1270D_002. B. Cross-polarized light: blue filter; image 1270D

Figure F26. Photomicrographs showing zircon crystals in amphibole layer (Sample 209-1270D-4R-1 [Piece 7, 33–37 cm]) (field of view = 0.7 mm). A. Plane-polarized light: blue filter; image 1270D_002. B. Cross-polarized light: blue filter; image 1270D_003.