538 



Dolomite. Devonian; fine; light buff and drab ; coarsely fossil if erous. Two speci- 

 mens. Near Osage Station, Mitchell County. Armstrong's quarry. Tenth Cen- 

 sus, 1880. 26122. 



Devonian; dark; compact. Near Mason City, Cerro Gordo County. J. L. 



Parker's quarry. Tenth Census, 1880. 26065. 



Devonian ; fine; baff and coarse drab. Two specimens. Near Bristow, Butler 



County. E. Frick's quarry. Tenth Census, 1880. 26088. 



Devonian; fine; compact. Cedar Falls, Black Hawk County. E, Carpenter's 



quarry. Tenth Census, 1880. 25900. 



Devonian; fine; yellowish brown. Two specimens. Near Laporte City, 



Black Hawk County. G. A. Knowles's quarry. Tenth Census, 1880. 26764. 



Sub-Carboniferous ; compact ; drab. Near Dakotah Station, Humboldt County. 



Quarry of Miner & Howell. Tenth Census, 1880. 26067. 



Sub-Carboniferous ; fine; compact. Humboldt, Humboldt County. A.B.Sny- 

 der's quarry. Tenth Census, 1880. 26062. 



Sub-Carboniferous : compact, with red blotches. Humboldt, Humboldt County. 



C. A. Labeer's quarry. Tenth Census, 1880. 26063. 

 Sub-Carboniferous; light brown. Near Iowa Falls, Hardin County. G. W. 



Chapman's quarry. Tenth Census, 18S0. 25986. 

 Sub-Carboniferous; compact; brown. Near Iowa Falls, Hardin County. L. 



L. Kelly's quarry. Tenth Census, 1880. 26705. 

 Sub-Carboniferous; fine; buff. Quarry, Marshall County. Le Grand Quarry 



Company. Tenth Census, 1880. 25479. 

 Sub-Carboniferous ;. fine ; light brown. Near Ames, Story County. P. R. 



Craig's quarry. Tenth Census, 1880. 25498. 

 Sub-Carboniferous; fine; drab. Near Ames Station, Story County. R. Coo's 



quarry. Tenth Census, 1880. 25466. 



Sub-Carboniferous; light gray; quartz-bearing. Keokuk, Lee County. P. 



Tiguo's quarry. Tenth Census, 1880. 25369. 



Sub-Carboniferous; finely vesicular. Near Franklin, Lee County. C. Graner's 



quarry. Tenth Census, 1880. 25368. 



Niagara; drab; mottled. Delhi, Delaware County. F. B. Doolit tie's quarry. 



Tenth Census, 1880. 25701. 



Siliceous dolomite. Lower Silurian ; coarse; variegated. Lansing, Allamakee 

 County. City of Lansing Quarries. Tenth Census, 1880. 26803. 



Upper Silurian; buff; porous. Near Postville, Allamakee County. E. H. 



William's quarry. Tenth Census. 1880. 26215. 

 Devonian ; compact. Near Waterloo, Black Hawk County. W. Lane's quarry. 



Tenth Census, 1880. 25933. 

 Niagara ; buff; dendritic. Near Delhi, Delaware County. J. H. Peter's quarry. 



Tenth Census, 1880. 25702. 



Ferruginous dolomite. Upper Silurian; coarse and fine; buff. Two specimens. 

 Near Sabula, Jackson County. E. A. Wood's quarry. Tenth Census, 1880. 25865. 



Upper Silurian; buff. Near Maquoketa, Jackson County. A. Connel's quarry. 



Tenth Census, 1880. 25830. 



Upper Silurian ; coarse ; yellow. Clinton, Scott County. T. Purcell's quarry. 



Tenth Census, 1880. 25829. 



Upper Silurian; fine; light buff. Near Le Claire, Scott County. E. Thele- 



mann's quarry. Tenth Census, 1880. 25826. 



