385 BITUMINOUS FAM*!LY, Observations. 1 There are several formations of Black or Common 1 Coal. Thus, it occurs in beds in transition limestone,' very abundantly, along with slate-clay, bituminous shale, micaceous sandstone, clay ironstone, claystone, porphyry, greenstone, and other trap rocks, either above or below the old red sandstone ; and also in beds in shell lime stone. 2. Black Coal appears in general to be an original formation or deposit, apparently formed in the same manner as Glance-Coal, and Graphite. Sixth Subspecies. Soot-Coal #. ltuss-Kohle, Voigt. Suss-Kohle, Karsten, Tabel. s. 5S.—Houille fuligineu.se, Hmy'. External Characters. Its colour is (lark greyish-black. It occurs massive. It is dull or glistening, and the lustre inclines to semi- metallic. The fracture is uneven, sometimes inclining to earthy. The fragments are blunt edged. It soils. I t is soft. It * It is named Clod Coal in West Lotlaair.