Maryland Geological Survey 193 



have advocated, and greatly strengthens Heer's contention that it is of 

 Cenomanian age, although it may extend upward into the Ttironian. 



The Patoot Series 



The lithology of the Patoot series, differentiated by Heer on paleo- 

 botanical grounds, is similar to that at Ata except for the greater num- 

 ber of " burnt " layers. The lower 500 feet of the section at Patoot 

 referred to the Atane series by Heer extends upward without any apparent 

 lithological break to a height of 2600 feet where there is a sandstone series 

 about 300 feet thick which may be of Tertiary age. White and Schuchert 

 suggest that the Patoot series represent transition beds between the 

 Atane series and the Tertiary. 



The recorded flora consists of the following species : 



Acer caudatum Heer 



Acer edentatum Heer 



Acerates arctica Heer 



Adiantum densinerve Heer 



Alnus protogwa Heer 



Aralia waigattensis Heer 



Arundo groenlandica Heer 



Asplenium (Benizia) calopteris Debey and Ettingshausen 



Asplenium pingelianum Heer 



Asplenium scrobiculatum Heer 



Betula atavina Heer 



Betula tremula Heer 



Betula vetusta Heer 



Carpinites microphyllus Heer 



Carpolithes longipes Heer 



Carpolithes patootensis Heer 



Cassia ettingshauseni Heer 



Ceanothus prodromus Heer 



Celastrophyllum crenatum Heer 



Celastrophyllum lanceolatum Ettingshausen 



Celastrophyllum serratum Saporta and Marion 



Celastrus arctica Heer 



Cephalotaxites insignis Heer 



Cinnamomum ellipsoideum Saporta and Marion 



Cinnamomum newberryi Berry 



Cissites aflinis Lesq. 



Colutea protogwa Heer 



Comptonia microphylla (Heer) Berry 



