MARYLAND AND DISTRICT OF COLUMBIA. 



175 



Maryland and District of Columbia.* 



Philadelphia, Wilmington and Baltimore 

 Ms. | Railroad. 



Ms. 



Baltimore and Ohio Railroad. 



Washington Branch. 



* By Prof. P. R. Uhler, of the Peabody Institute, Baltimore, except B. & O. R. R. west. 



1. Kaolin occurs near Annapolis, near Northeast, and near the Metropolitan Railroad in Mont- 

 gomery county. 



2. Harford county, a few miles northwest of the Philadelphia, Wilmington & Baltimore Rail- 

 road, yields a fine green serpentine in vast blocks, equal to verd-antique in splendor and polish, 

 besides the common building sort. In the Jurassic beds on the same railroad, also on the Wash- 

 ington branch of the Baltimore and Ohio Railroad, vast beds of nodular carbonates of iron occur, 

 rich m metal. 



3. The Woodstock, Ellicott's City and Port Deposit granites are superior of their kind. 



4. Bare Hills mineral region. It has chrome and copper ores, asbestos, serpentine and 

 magnesian rocks. 



