MARYLAND GEOLOGICAL SURVEY 43 



1840. 



Bailey, J. W. Xew Localities of Infusoria in the Tertiary of 

 Maryland. 



Amer. Jour. Sci., 2nd ser., vol. vii, 1849, p. 437. 



Piscataway is mentioned as the most northerly point where infusoria have 

 been found in the Miocene. 



1852. 



Desor,, E. Post Pliocene of the Southern States and its relation 

 to the Laurentian of the North and the Deposits of the Valley of the 

 Mississippi. 



Amer. Jour. Sci., 2nd ser., vol. xiv, 1852, pp. 49-59. 



The boulders in the vicinity of Washington are said to have been brought 

 to their present position by floating ice bergs carried by the Potomac river 

 from beyond the Blue Ridge. A suggested correlation of the superficial 

 deposits of Maryland with the Laurentian of Canada and the post-Pliocene 

 of South Carolina is discussed. 



Fisher, Pt. S. Gazetteer of the State of Maryland compiled from 

 the returns of the Seventh Census of the United States. New York 

 and Baltimore, 1852, 8vo, 122 pp. 



Contains numerous descriptions of the geography and geology of different 

 portions of the State. The diatomaceous earth (called "siliceous clay") bed 

 at Piscataway is briefly described. 



HiGGiNS, James. The Second Report of James Higgins, M. D., 

 State Agricultural Chemist, to the House of Delegates of Maryland. 

 8vo, 118 pp. Annapolis, 1852. 



Md. House of Delegates, Jan. Sess., 1852. 8vo, 126 pp. 



Large deposits of phosphate of iron are reported to occur on the farm of 

 Mr. James Mulliken and it has also been noticed in several other places in 

 that neighborhood. "When pure it contains about 28 per cent, of phosphoric 

 acid. The average of six analyses of the above deposit, taken and made at 

 different times, shows 16 per cent, of phosphoric acid." 



The soils and marls of the county are discussed and many analyses given. 



Johnson, Alexander S. Notice of some undescribed Infusorial 

 Shells. 



Amer. Jour. Sci., 2nd ser., vol. xiii, 1852, p. 33. 



The infusoria Asterodiscus nonarius and Astcrolampra septenaria from 

 Piscataway are described. 



