4 THE OLDER MESOZOIC FLORA OF VIRGINIA. 



shales of this bed are rich in plants, but owing to the mode of working 

 the coal, which is confined mostly to the overlying bed, they are rarely 

 reached. 



Deep Run is another locality that has yielded plants. It lies about 3 

 miles east of Carbon Hill, in a small detached strip of coal-bearing strata. 

 Midlothian, The Gowry, Black Heath, &c, are found some miles south of 

 James River on the eastern border of the area. They yield some fine 

 plants which, however, are collected with difficulty owing to the decom- 

 posed state of the material found on the old "dumps." 



Clover Hill, at the southeastern end of the Richmond Coal Field, is the 

 most important locality for the plants described in this memoir. Most of 

 the impressions obtained by me, and the best preserved of them, came from 

 this place. A tunnel was cut here recently to drain the water from one of 

 the main shafts, and from this a large amount of sound rock was taken. 

 Some of this shows good impressions of plants. Among these are the 

 largest and most perfect specimens figured in this work. 



The Hanover Area has yielded some plants, mostly, as it seems, from 

 the same horizon as that of those from the Richmond Coal Field. 



The Cumberland Area lies about 30 miles west of the Richmond Area. 

 The longer axis of this, and of all of the areas yet to be mentioned, lies in 

 a direction much more east, of north than does that of the Richmond Area. 

 In this case it runs about 25° east of north. This area begins on the south 

 in Prince Edward County, and extends northeast for 22 miles, lying mainly 

 in Cumberland County. Its southern end is much cut up by erosion, but 

 north of the Appomatox River it forms a continuous belt with an average 

 width of li miles. This area, in all its geological features, is closely allied 

 to the Richmond Area, and is in many features unlike the areas yet to be 

 described, that lie farther west. It contains some coal that locally is work- 

 able, and yields some plants. The number of plants from this area might, 

 no doubt, be largely increased were the strata exposed by working for coal. 

 As it is, there is very little exposure of them, and almost no search has been 

 made for the plants. 



The Pittsylvania Area is a long and narrow belt, extending through 

 Pittsylvania County to the southern border of the State. It is continued 



