. Bulletin of the Geological Society of America. Geology. ALLIED PHENOMENA IN ENGLAND. 53 the mud, which also sealed up the coal bed. Toward the dip these masses become fewer and smaller. ENGLAND Figure 20 illustrates a section in the " Main " coal at Moira, Leicester- shire, England. The plane or surface separating the two distinct masses of clayey ma- terial, filling the opening made in the coal, together with the reverse crumpling to which these intrusive masses have been subjected, points to the gash having been formed at two periods, the smaller and paler deposit indicating by i
. Bulletin of the Geological Society of America. Geology. ALLIED PHENOMENA IN ENGLAND. 53 the mud, which also sealed up the coal bed. Toward the dip these masses become fewer and smaller. ENGLAND Figure 20 illustrates a section in the " Main " coal at Moira, Leicester- shire, England. The plane or surface separating the two distinct masses of clayey ma- terial, filling the opening made in the coal, together with the reverse crumpling to which these intrusive masses have been subjected, points to the gash having been formed at two periods, the smaller and paler deposit indicating by its position that it is probably the older of the two. The forked vein of cla}' shown in figure 21 was Observed by the Writer Figure 20—Section in the " Main" Coal of Leices- in the same seam as the last and tershire,England. about 3 miles distant from it. The One-seventieth natural size. only explanation seems to be that the coal was bent and opened a crack in its lower layers, into which the soft under clay swelled until the cracks were filled solid. Figure 22 apparently illustrates a combination of the phenomena seen in the sections shown in figures 20 and 21, for here we have the coal bed. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
