106 



LARAMIE FLORA OF THE DENVER BASIN. 



Subsequent study of the Laramie flora, 

 however, does not bear out this suggestion, 

 for so far as now known the two floras contain 

 no species in common. This is also the view 

 reached by Berry, 17 who pointed out that of the 

 123 Patoot species 20 occur in the Dakota 

 sandstone, 22 in the Karitan, 19 in the Mago- 

 thy, 8 in the Tuscaloosa, and 4 in the Black 

 Creek formation. He says: "The large num- 

 ber of Atane species present (34),' as well as 

 the numerous Dakota, Raritan, and Magothy 

 species, precludes considering the flora as 

 young as, for example, the Laramie." 



It may be accepted, then, that the Laramie 

 flora is younger than that of the Patoot series 

 and there is little or no relation between them. 



RELATIONS TO THE UPPER CRETACEOUS OF 

 EUROPE. 



As a preliminary to the consideration of the 

 possible relations between the flora -of the 

 Laramie and such floras as are available in the 

 European Upper Cretaceous, it may be of 

 interest to give a brief tabular view of the 

 Upper Cretaceous section that is now quite 

 generally accepted. It is taken in the main 

 from the fifth edition of De -Lapparent's 

 Geology : 



Danian. , 



Aturian( Maertrichtian WpperSenonian. 

 ICampaman J 



Err^cherian/ Santonian lLower Senonian. 

 \ConiacianJ . 



Turoma^ ™ 1 - 

 \Ligenan. 



Cenomanian. 



The Campanian, the lower division of the 

 Aturian (Upper Senonian), is thought to 

 correspond approximately to the Pierre shale 

 and the Pox Hills sandstone of the United 

 States. The Maestrichtian, which constitutes 

 the upper division of the Aturian (Upper 

 Senonian), together with the Danian, corre- 

 sponds to the Laramie, at least in position. 

 The Maestrichtian is abundantly plant-bearing 

 at a number of localities, especially in the 

 Munster Basin of Westphalia. The plants 

 from these localities — Sendenhorst, Haldene, 

 Lunfiide, etc. — were studied and described 



ii Berry, E. W., Maryland Geol. Survey, Upper Cretaceous, p. 196, 

 1916. 



specially by Hosius 18 and by Hosius and 

 Von der Marck. 19 



E. W. Berry, 20 in a chapter on the Upper 

 Cretaceous floras of the world, has compiled 

 a complete list of the Maestrichtian flora of 

 the Munster Basin, which is as follows: 



Apocynophyllum cuneatum Hosius and Von der 

 Marck. 



Apocynophyllum subrepandum Von der Marck. 



Aralia denticulata Hosius and Von der Marck. 



Cf. Ceanothus sp. 



Chondrites furcilentus latior Von der Marck. 



Chondrites intricatus Sternberg. 



Chondrites jungiformis Debey and Ettingshausen. 



Chondrites polymorphus Hosius and Von der Marck. 



Chondrites subcurvatus Hosius and Von der Marck. 



Comptonia tenera Hosius and Von der Marck. 



Cunninghamites elegans (Corda) Endlicher. 



Cunninghamites squamosus Heer. 



Dewalquea gelindensis Saporta and Marion. 



Dewalquea haldemiana Saporta and Marion. 



Dewalquea haldemiana angustifolia Hosius and 

 Von der Marck. 



Dewalquea haldemiana latifolia Hosius and Von 

 der Marck. 



Dewalquea insignis Hosius and Von der Marck. 

 . Dryandroides haldemiana Hosius and Von der 

 Marck. 



Dryandroides macrophylla Hosius and Von der 

 Marck. 



Eolirion? nervosum Hosius and Von der Marck. 



Eolirion primigenum Schenck? 



Eolirion? subfalcatum Hosius and Von der Marck. 



Eucalyptus haldemiana Debey. 



Eucalyptus inaequilatera Von der Marck. 



Ficus angulata Hosius and Von der Marck. 



Ficus densinervis Hosius and Von der Marck. 



Ficus laurifolia Hosius and Von der Marck. 



Frenelopsis konigii Hosius and Von der Marck. 



Haliserites contortuplicatus Von der Marck. 



Lauras affinis Hosius and Von der Marck. 



Myrica leiophylla Hosius and Von der Marck. 



Myrica primaeva Hosius and Von der Marck. 



Cf. Myrtophyllum cryptoneuron Saporta and 

 Marion. 



Nerium rohlii Von der Marck. 



Cf . Oreodaphne apicifolia Saporta and Marion. 



Osmunda haldemiana Hosius and Von der Marck. 



Pinus mpnasteriensis Hosius and Von der Marck. 



Populus tremulaeformis Hosius and Von der Marck. 



Pisidonia cretacea Hosius and Von der Marck. 



Quercus asymetia Hosius and Von der Marck. 



!' Hosius, A., Die in der We3tfalischen Kreideformation vorkommen 

 den Pflanzenreste Munster, pp. 1-34, 1869; Uefoer einige Dicotyledonen 

 der WestfSlischen Kreideformation: Palaeontographica, vol. 17, pp. 

 89-104, pis. 12-17, 1869. 



» Hosius, A., and Von der Marck, Die flora der Westfalischen Kreide- 

 formation: Palaeontographica, vol. 26, pp. 125-256, pis. 24-44, 1880. 



*> Maryland Geol. Survey, Upper Cretaceous, p. 283, 1916. 



