MARYLAND GEOLOGICAL SURVEY 895 



width, which is in the middle part of the leaf. Apex acute or obtuse. Base 

 cuneate. Margins entire. Petiole rather long and very stout. Midrib 

 also stout. Secondaries branching from the midrib usually at acute angles, 

 subopposite or alternate, parallel, camptodrome. Tertiaries forming 

 polygonal areoles whose relative prominence is one of the features of this 

 species. 



This species, which is quite suggestive of the modern Diospyros vir- 

 giniana Linne, was described by Heer from the Dakota group of Nebraska 

 nearly half a century ago. It has proved to be a most wide-ranging form, 

 having been identified at both the Atane and Patoot horizons in Green- 

 land; in the Cenomanian of Saxony and the Turonian of Bohemia; from 

 various localities within the Dakota group, including its southern exten- 

 sion, the Woodbine formation of Texas; and, with the exception of the 

 fragments from Marthas Vineyard and Long Island, which are of ques- 

 tionable identity, it is present, in either the Earitan, or the Magothy, or 

 homotaxial formations, from New Jersey to Alabama. 



Its most marked character is the prominence of its tertiary areolation. 

 It is common at various localities in the lower Tuscaloosa of western 

 Alabama and continues upward into those beds in Hale County which 

 have been placed in the basal portion of the Eutaw formation. 



Occurrence. EARITAN FORMATION. Bull Mountain, Cecil County. 

 MAGOTHY FORMATION. Bodkin Point, Anne Arundel County. 



Collection. Maryland Geological Survey. 



DIOSPYROS ROTUNDIFOLIA Lesquereux 

 Plate XC, Fig. 3 



Diospyros rotundifolia Lesquereux, 1874, Cret. FL, p. 89, pi. xxx, fig. 1. 

 Diospyros rotundifolia Lesquereux, 1892 Mon. U. S. Geol. Survey, vol. xvii, 



p. 112, pi. xvii, figs. 8-11. 

 Diospyros rotundifolia Berry, 1906, Ann. Kept. State Geol. of New Jersey 



for 1905, p. 139. 

 Diospyros rotundifolia Berry, 1906, Bull. Torrey Bot. Club, vol. xxxiii, p. 



181. 

 Diospyros rotundifolia Berry, 1914, Prof. Paper U. S. Geol. Survey, No. 84, 



p. 62, pi. xiv, fig. 14. 



Description. Leaves entire, variable in size, 4 cm. to 10 cm. in length 

 by 2 cm. to 7 cm. in maximum width, which is in the middle part. Outline 



