NO. 3 SMITHSONIAN EXPLORATIONS, 1915 19 
After completing the investigation of the geyser and hot-spring 
deposits, a trip was made to the Fossil Forest in the northeastern 
section of the Park, in the Lamar River Valley. Large collections 
were made of silicified wood and various minerals; one of the latter 
being a remarkable and beautiful form of calcite rosettes (figs. 29, 
80), 3; 22). 
Fic. 28.—Looking across Lamar River from the north to fossil forest ridge 
2,500 feet above the valley. Ridge formed of great thickness of volcanic 
breccia deposited in great layers at intervals sufficient to permit of growth of 
coniferous forests. Stumps of fossil trees were measured 9 feet in” diameter, 
6 feet above their roots. Seven successive forests that had been destroyed by 
volcanic deposits were seen in the cliffs shown in this view. Walcott camp in 
the foreground. Photograph by Walcott. 
Dr. Wherry, assistant curator, division of mineralogy and_ pe- 
trology, U. S. National Museum, describes the calcite rosettes as 
follows: 
The remarkable character of these specimens is illustrated by the photo- 
graphs of four of them shown in figures 29, 30, 31, and 32. They consist of 
