Houtzdale quadrangle

Probable correlative of upper bed in the Houtzdale quadrangle c Average of eight columns... 

Figure 3. Correlation of Upper Freeport coal beds in Houtzdale quadrangle by layers having similar petrographic analyses...

Figure 4 illustrates the coals of the Lower Kittanning formation in the Houtzdale quadrangle. In much of western Pennsylvania only one coal is mined as the Lower Kittanning coal (Figure 1). Here, however, there are five beds which may be mineable, at least locally. Most of the beds differ from...

The quantitative maceral analyses presented above are used to demonstrate petrographic continuity of coals from place to place. The examples used were selected to emphasize different aspects of regional and local situations. Problems encountered in the Houtzdale quadrangle illustrate that some measure of continuity can be established locally in spite of rapid changes in thickness and character of the coal beds involved. 

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