ILLUSTRATIONS 



FACING PAGE 



I. Fig. 1.- — View along Paint Branch showing the rocky channel 



characteristic of Piedmont streams 72 



Fig. 2. — View of Patuxent River at Priest Bridge showing the 

 low muddy vegetation-covered banks characteristic of Coastal 



Plain streams 72 



II. Fig. 1. — View showing indurated ledges of the Patuxent forma- 

 tion, W street near 12th street, Washington, D. C 80 



Fig. 2. — View showing flooded iron mine in the Arundel forma- 

 tion near Muirkirk 80 



III. View showing silicified cycad trunk, Cycadeoidea marylandica 



(Fontaine) Cap. and Solms., from the Patuxent formation of 

 Prince George's County 84 



IV. Restoration of the commonest Cretaceous Dinosaur of Prince 



George's County, Pleurocoelus nanus Marsh (after Lull), i/is 



natural size 88 



V. Views showing characteristic fossils of the Upper Cretaceous of 



Prince George's County 9*j 



VI. Fig. 1. — View showing irregular nodules in the Matawan forma- 

 tion near Priest Bridge 100 



Fig. 2. — View showing contact between Aquia greensand and 



Nanjemoy pink clay at Upper Marlboro 100 



VII. Views showing characteristic fossils of the Eocene of Prince 



George's County 104 



VIII. Fig. 1. — View showing indurated ledge of fossiliferous Miocene 



sand near Magruder Ferry 112 



Fig. 2. — View showing surface of Lafayette plain near Chelten- 

 ham 112 



IX. Fig. 1. — ^View showing the dissected surface of the Sunderland 



plain in the vicinity of the Patuxent River 124 



Fig. 2. — View showing materials of the Talbot formation over- 

 lying Eocene greensand near Piscataway 124 



X. Fig. 1. — ^View showing mixed hardwood forest near Forestville. . 220 

 Fig. 2. — View showing mixed oak forest of merchantable class 



near Marlboro 220 



XI. Fig. 1. — View showing a scrub pine forest near Seabrook 224 



Fig. 2. — View showing pulpwood for shipment, Brandywine 



Station, Popes Creek branch. P., B. & W. R. R 224 



XII. Fig. 1. — View showing method of hauling piles near Surrattsville. 228 

 Fig. 2. — View showing yellow poplar logs for export, MuUikin 

 Station, Popes Creek branch. P., W. & B. R. R 228 



