152 W. M. Fontaine— Mesozoic Strata of Virginia. 
series of the Richmond Coal field. It has no workable coal, 
this series is composed of sandstones with subordinate beds of 
shale. The sandstones of the uppermost portions, especially 
those found in the northern extremity of the tract, are remark- 
The stones are often quite fresh, and sometimes of very ra 
size. [I saw one granite bowlder ten feet through, and not lly 
are penetrated by several trap dykes) They form certainly 
the youngest beds of the series. The dip is very obscure, but 
appears to be to the northwest. When these beds are traced 
to the eastern side of the area, where they pass under the Ter- 
tiary, we find that the number and size of the stones greatl 
decreases. The beds now take in fragments of the shale, 20© 
other strata of the lower series, which feature is never seen 0? 
the western side. This of course should be the case, if the 
eroding force acted from the west and southwest. These upp 
