. Additional notes on the Grinnell ice-cap. Ice -- Nunavut Baffin Island. 140 Field Museum of Natural History—Geology, Vol. VII width between and 2 mm. A few exceed 2 mm., which is to be expected in an octahedrite transitory between two classes. No grain boundaries in the kamacite bands have been observed (fig. 62) but certain markings resembling hatchings are present. These may be scratch marks and some certainly are; others may. Fig. 62. Enlarged kamacite bands showing no grain boundaries. At the center is a troilite nodule. X7. be true hatchings. The bands also contain numerous microsc
. Additional notes on the Grinnell ice-cap. Ice -- Nunavut Baffin Island. 140 Field Museum of Natural History—Geology, Vol. VII width between and 2 mm. A few exceed 2 mm., which is to be expected in an octahedrite transitory between two classes. No grain boundaries in the kamacite bands have been observed (fig. 62) but certain markings resembling hatchings are present. These may be scratch marks and some certainly are; others may. Fig. 62. Enlarged kamacite bands showing no grain boundaries. At the center is a troilite nodule. X7. be true hatchings. The bands also contain numerous microscopic pustule-like bodies as well as pits, but the nature of these has not been determined. The former may be the result of differential action of the acid; the latter are probably etching pits. Taenite lamellae bounding the kamacite bands are typical, either straight, wavy, or irregular, and except for a few dark spots enclosed by taenite lamellae, known as "flecking" (fig. 63), no other special feature of the taenite component has been observed. Both normal and dense plessite fields (figs. 64, 65) are numerous, and there is little deviation from the usual in the character and disposition of either the kamacite or the taenite lamellae in these fields. Taenite lamellae with thickened ends are relatively Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Roy, Sharat Kumar, 1897-1962. Chicago : Field Museum of Natural History
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