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Clay Mineral Facies of Certain Pennsylvanian Underclays

出版	University of Illinois at Urbana-Champaign, 1962
URL	http://books.google.com.hk/books?id=Rq3MhsMs4csC&hl=&source=gbs_api

註釋Because of the above variations, a study of the clay mineralogy of several underclay units was undertaken in order to determine whether or not there was any order in the regional distribution of the clay mineral components of underclays which in turn determine their properties. The refractoriness and light fired color of underclays generally increase with an increase in the quantity of the clay mineral kaolinite. The underclay of No. 2 Coal was selected for investigation and sampled throughout the Eastern Interior Basin since this underclay seemed to be the boundary between the so-called high kaolinitic underclays and the low kaohnitic underclays (Grim and Allen, 1938). After an orderly lateral variation in clay mineralogy was noted in the underclay of the No. 2 Coal two other underclay units were selected for study from higher in the section to see if similar clay mineral variations were present in underclays other than the underclay of the No. 2 Coal. Those selected were the underclay of the Herrin (No. 6) Coal of Illinois and the underclay of the Middle Kittanning (No. 6) Coal of the Ohio and Pennsylvania region. The Colchester (No 2) Coal of Illinois correlates with Coal IIIa of Indiana, the Schultztown Coal of western Kentucky, and the Croweburg Coal of Missouri, Iowa, Kansas and Oklahoma (Kosanke et al., 1960) and (Seanght et al., 1953). The Herrin (No. 6) Coal of Illinois correlates with the No. 11 Coal of western Kentucky (Kosanke et al., 1960). The No. 6 Coal of Ohio is believed to be equivalent to the Middle Kittanning Coal of Pennsylvania (Sturgeon, 1958), (G.S.A. Guidebook, 1959).