LETTER OF TRANSMITTAL 



To His Excellency Austin L. Crothees, 



Governor of Maryland and President of the Geological Survey Com- 

 mission, 



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

 series of reports dealing with the systematic geology and paleontology of 

 Maryland. The preceding volumes have dealt with the Tertiary and 

 Quaternary deposits and the remains of animal and plant life which they 

 contain. The present volume treats of the Lower Cretaceous deposits 

 and their contained life, a knowledge of which is very important from an 

 educational and scientific standpoint. I am. 



Very respectfully, 



WM. BULLOCK CLARK, 

 State Geologist. 



Johns Hopkins University, 



Baltimore, September, 1911. 



