TRANSACTIONS 



OF THE 



GEOLOGICAL SOCIETY OF PENNSYLVANIA. 



VOL. I . — PART I. 



ON THE GEOLOGICAL POSITION OF CERTAIN BEDS WHICH 

 CONTAIN NUMEROUS FOSSIL MARINE PLANTS OF THE 

 FAMILY FUCOIDES; NEAR LEWISTOWN, MIFFLIN COUNTY, 

 PENNSYLVANIA. By Richard C. Taylor, Fellow of the Geol. Soc. 

 of London ; Associate Fellow of Inst. Civ. Eng. London ; Member of the 

 Geol. Soc. of Pennsylvania ; of the Acad. Nat. Sci. of Philadelphia ; and of 

 the Albany Institute, New York. 



In a recent number of the London Magazine of Na- 

 tural History, I communicated a drawing of Fucoides 

 Jllleghcmiensis, so named by Dr Harlan of Philadelphia ; 

 together with a slight sketch of some of the rocks com- 

 prised within the grauwacke group of central Pennsyl- 

 vania, and a more detailed notice of the strata in which 

 numerous fossil plants of this family prevail. 



I propose to state the substance of that article, as re- 

 lates to the Fuci, and to annex some observations which 

 have been made subsequent to that communication. 



Fossil plants of this family are very common in the 

 silicious and argillaceous deposits of the transition series, 

 in this country. In the grauwacke group of Sweden, 

 Mr De la Beche enumerates two species ; and one 



