LETTER OF TRANSMITTAL 



To His Excellency Phillips Lee Goldsborough, 



Governor of Maryland and President of the Geological Survey Com- 

 mission, 



Sir: — I have the honor to present herewith the sixth volume of a series 

 of reports dealing with the systematic geology and paleontology of Mary- 

 land. The preceding volumes have dealt with the Lower Devonian, Lower 

 Cretaceous, Eocene, Miocene, and Pliocene and Pleistocene deposits and 

 the remains of animal and plant life which they contain. The present 

 volume treats of the Middle and Upper Devonian deposits and their con- 

 tained life, a knowledge of which is very important from an educational 

 and scientific standpoint. I am. 



Very respectfully, 



WM. BULLOCK CLAEK, 



State Geologist. 

 Johns Hopkins University, 



Baltimore, January, 1913. 



