1879.] The Mesozoic Sandstone of the Atlantic Slope. 287 
about equally divided between the north and south sides of the 
James river. On the succeeding page six analyses are given of 
West Virginia coals, and three from the Richmond basin. On p. 
44 is a table of the coal shipped from the basin in various years, 
and the whole concludes with a comparative table of the total 
amounts shipped from the principal basins in Pennsylvania and 
Maryland, and from the Richmond basin. 
The illustrations are on two plates; Plate 1 contains a map of 
Virginia and part of North Carolina, south of the Potomac 
and east of the Blue Ridge with the lines of strike of the four 
belts into which the author has thrown the formation. The areas 
of drainage are well marked on this map, and the Mesozoic 
shaded. 
Plate 1 contains, Fig. 1, a geological section of the bore hole; 
Fig. 2, a section of the beds on a vertical plane perpendicular to 
the strike; Fig. 3, a long section along the James river from 
Richmond to Scottsville, showing a synclinal between the western 
and middle western Mesozoic belts, a synclinal in the middle 
eastern, and a probable eroded anticlinal between the latter and 
the eastern, where the rocks seem to dip under newer formations 
‘to and under the sea. 
In this connection it is almost a pity to note even trifling errors 
in Mr. Heinrich’s paper. These are not confined to “elliptic” 
for elliptical (p. 7), “dolorite” for dolerite (pp. 17 and 37), 
square acres (p. 41), and other similar oversights of the proof- 
reader in correcting the text, but may be even found in the maps, 
as in “Ezoic” for Eozoic (Plate 11 Fig. 3, &c.). It was to be 
hoped that these defects would have been corrected in the vol- 
ume of the Transactions of the Institute of Mining Engineers, in 
which the paper appears. 
Prof. Fontaine's Paper —After his grouping of the outcrops of 
the Mesozoic previously given, the author notices a deposit of 
stones which plays an important part in the NW. They are 
neither conglomerate nor boulders. Under this head is classed 
the “ Potomac Marble,” which is all of limestone fragments. In 
the Pittsylvania belt, however, the stones are the product of the 
granite and azoic rocks lying near. 
In his description of the Richmond basin, Prof. Fontaine has 
probably been led into error by Rogers and Lyell, and in spite of 
his own notes, when he says, “ The lower series, from three to 
five hundred feet thick, rests immediately on the granitoid gneiss, 
