Smithsonian Report, 1948.—Brown PLATE 2 
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1. Sections of an algal pillar. 2. Broad, open valley of Whisky Basin, with algal 
pillars in figure 1, from a different angle, in foreground. 
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PAAR 
3. Lengthwise section through middle of a pillar, showing layers of algal lime 
covering abandoned insect cases or worm tubes, and arching over the top. 
Light-colored material in center is calcite that fills the space previously occupied 
by wood. The larval cases are filled with calcareous sand and ostracodes. 
Specimen from Bridger formation, 6 to 8 miles southwest of Opal, Wyo. 
Collected by G. P. Merrill, 1903. X }. 
