Maryland Geological Survey 237 



Viburnum hollickii Berry 

 Viburnum montanum Knowlton 

 Viburnum problematicum Knowlton 

 Widdringtonites complanata Lesquereux 

 Woodwardia crenata Knowlton 

 Woodwardia sp. 



The Laramie Formation 



In those parts of the region where the Upper Cretaceous section is 

 complete it ends with the Laramie formation. The age of this and 

 similar coal-hearing beds has been the subject of controversy since the 

 days of King and Hayden, and a vast literature has been inspired, the 

 question still being a very live issue among geologists and paleontologists. 

 By definition the Laramie was the topmost member of the conformably 

 Cretaceous series and the Federal Survey has recently promixlgated the 

 ruling that the lithologically somewhat similar but unconformably over- 

 lying beds (Lance, Hell Creek, Ceratops, Eaton, Arapahoe, Denver, etc.) 

 are to be considered as of early Eocene age. 



It is almost impossible to disentangle the flora of the true Laramie in 

 published works, and I am again indebted to Dr. F. H. Knowlton, who is 

 completing a monograph of this flora at the present time, for the follow- 

 ing list of the Laramie plants from this horizon in the Denver basin and 

 adjacent areas in Colorado where the stratigraphic relations are well 

 understood. Many additional and new forms will be described in Dr. 

 Knowlton's contemplated monograph. 



Anemia supercretacea Hollick 

 Anemia sp. 



Anona robusta Lesquereux 

 Anona sp. nov. 

 Apocynophyllum sp. nov. 

 Aristolochia sp. nov. 



Artocarpus lessigiana (Lesquereux) Knowlton 

 Artocarpus sp. nov. 

 Asplenium sp. nov. 

 Carpites rhomboidalis Lesquereux 

 Carpiten sp. nov. 

 Ceanothus sp. nov. 

 Celastrus sp. nov. 

 Cercis eocenica Lesquereux 

 Cinnamomum affine Lesquereux 

 16 



