Plate 61 



1. Horse Creek. This specimen, unlike that shown in plate 60, was cut along a plane 

 on which the phosphide lamellae make a rectangular pattern. The photograph shows only 

 coarse lamellae, with fine phosphide particles, in some places oriented parallel with the 

 lamellae. One area has been in\aded by o.xide. Picral 30 seconds; X 150. 



2. Horse Creek, The area shown in figure 1, after additional light etching with sodium 

 picrate, darkening the phosphide lamellae. The areas in the two figures are not quite iden- 

 tical, the double horizontal lamella near the center of figure 1 appearing in figure 2 about 

 an inch higher (upper left corner). 



3. Horse Creek. Part of the area in figures 1 and 2, showing the double horizontal 

 lamella and the large vertical one. The latter has a phosphide-iron eutectic core, similar 

 to those in Chesterville and Rio Loa (pis. 58, 59), but more irregular. Picral 15 seconds 

 and light sodium picrate; X 600. 



4. Horse Creek. An area with \-ery fine and also coarser lamellae. The rectangular 

 pattern is reproduced in miniature in some of the areas b_\- extremely fine oriented lamellae. 

 Picral 50 seconds; X 60. 



181 



507394—44- 



