550 REPORT ON NATIONAL MUSEUM, 1886. 



Serpentine. Dark green; very fine and compact; takes a high polish. Deer Creek, 

 Harford County. Deer Creek quarries. Tenth Census, 1880. 26868. 



Light and dark green, mottled; fine and compact; takes a high polish. 6 by 



6 by 3 inches. Broad Creek, Harford County. Centennial, 1876. 17514. 



Compact; dark green ; takes a high polish. 6-inch cube. Broad Creek, Har- 

 ford County. Centennial, 1876. 17517. 



Dark green; fine and compact; takes only a dull polish. Near Baltimore. 



G. A. Leakin, 1883. 27682. 



Biotite gneiss. Coarse; gray. Port Deposit, Cecil County. Quarry of McClena- 

 han & Bro. Tenth Census, 1880. 25359. 



Light gray; fine and medium. Two specimens. Near Baltimore City, Balti- 

 more County. J. Harris's quarry. Tenth Census, 1880. 25576. 



Coarse; dark gray. Opposite Ellicott City, Baltimore County. C.J.Werner's 



quarry. Tenth Census, 1880. 25358. 

 Fine; light and dark gray. Two specimens. Jones Falls road, Mount Royal, 



Baltimore County. J. Curley's quarry. Tenth Census, 1880. 26930. 

 Biotite granite. Medium; gray. Near Woodstock, Baltimore County. W. F. 

 Weller's quarry. Tenth Census, 18,i0. 25361. 



Medium; gray. Near Woodstock, Baltimore County. Fox Rock quarry. Tenth 



Census, 1880. 25360. 



Coarse; gray. Granite, Baltimore County. Quarry of Gill & McMahon. Tenth 



Census, 1880. 25403. 



Fine; gray. Gwynn's Falls, Baltimore County. Old Winan estate. Tenth 



Census, 1880. 26867. 

 Fine; light gray. Montrose, Montgomery County. H. P. Dwyer's quarry. 



Tenth Census, 1880. 26947. 

 Dolomite [marble]. Lower Silurian ; white; crystalline. Texas, Baltimore County. 

 A block from the top stone of the Washington Monument. Barney Mooney, 1884. 

 36050. 

 Lower Silurian; white; crystalline. Cockeysville, Baltimore County. Beaver 



Dam Marble Compauy. Tenth Census. 27062. 

 Lower Silurian ; white; crystalline. Cockeysville, Baltimore County. Colonel 



Clark, 1881. 25206. 

 Lower Silurian; white; crystalline. Cockeysville, Baltimore County. Tenth 



Census, 1880. 25015. 

 Lower Silurian; white; crystalline. Cockeysville, Baltimore County. Tenth 



Census, 1880. 25003. 

 Magnesian limestone [marble]. White, with purple stripes; crystalline. New 



Windsor, Carroll County. William N. Chew's quarry. Tenth Census. 26931. 

 Light blue-gray; crystalline. Near New Windsor, Carroll County. A. A. 



Roop's quarry. Tenth Census, 1880. 26807. 

 Gray; laminated. Keedysville, Washington Count}". John Snear's quarry. 



Tenth Census, 1880. 26205. 

 White; crystalline. Union Bridge, Frederick County. D. Riuehardt's quarry. 



Tenth Census, 1880. 26829. 



Union Bridge, Frederick County. D. Riuehardt's quarry. Tenth Census, 1880- 



26830. 

 Conglomerate breccia [marble]. Triassic ; red, variegated. Frederick County • 

 Slab 20 by 30 by 1£ inches. Used in the interior decorations of the Capitol at 

 Washington, D. C. Col. Edward Clark, 1881. 28744. 



