28 



PLATE 2 



Reflected plane polarized light, Ortholux Petrographic Microscope 

 Polished surfaces of Samples no. 1 (figs. 1-3) and 2 (figs. 4-6) 



Figure 



1. Large, dark brown-gray spore, 300 \i long and 22 [i thick, and small vit- 

 rinite lenses (V) embedded in fine-grained groundmass. This spore is 

 probably Tasmanites or Leiosphaeridia . Smaller spores also can be seen 

 in this figure. 25X oil immersion objective. Magnification: 250X. 



2. Microstratified coal containing a large amount of pyrite (P) that occurs both 

 as single grains of a few microns in diameter and as aggregates up to 20 \±. 

 The large spore (SP), 9 |a long, is medium gray with a somewhat higher re- 

 flectance than the spore in figure 1, plate 2. 60X oil immersion objective. 

 Magnification: 600X. 



3. Several quartz grains (Q) in different positions of extinction. Most of the 

 grains are single crystals; twinning, where present, is irregular. 12. 5X 

 oil immersion objective . Magnification: 120X. 



4. Polished surface showing stratified black coal (Sample no. 2), brown 

 transitional layer (fig. 5), and the limestone that contains quartz grains, 

 shell fragments, and a few thin carbonaceous partings near the coaly lay- 

 er. Actual size. 



5. Transitional layer between the coal and the limestone. The angular grains 

 are dolomite and some calcite (X-ray analysis, thin section). Coal occurs 

 only in the interstices. 25X oil immersion objective. Magnification: 250X, 



6. Limestone adjacent to coal Sample no. 2. Microstylolites interrupt a thin 

 carbonaceous parting. 25X oil immersion objective. Magnification: 250X. 



