Maryland Geological Survey 335 



both the Pacific and the Western Interior fauna considers that " In time 

 range the Chico formation apparently began somewhat earlier and 

 continued somewhat later than the Colorado fauna of the interior seas, 

 but it did not extend to the end of the Cretaceous, and latest Cretaceous 

 time is probably not represented by marine deposits on the Pacific Coast." 



Correlation With European Strata 



The correlation of the Maryland Upper Cretaceous formations with 

 European deposits can be at best only approximate since only a few 

 identical species have been recognized. A number of additional forms 

 show close affinities with those of remote areas, but in general the corre- 

 lation can only be determined on the basis of the fades of the floras and 

 faunas. 



In a detailed study of the Earitan flora, as developed in the argillaceous 

 beds of the New Jersey area from which one hundred and sixty-six species 

 of plants were described in 1910/ it was shown that in terms of the 

 European section the Earitan was unquestionably Cenomanian in age. 

 This conclusion receives additional confirmation from the present study. 



The Magothy flora because of its resemblance to that of the Earitan has 

 also been considered to be of Cenomanian age, although it has several 

 times been suggested 2 that it represents the Turonian stage. The paleo- 

 botanical studies carried out during the past ten years and covering the 

 Coastal Plain from New York to Texas completely confirm this opinion. 

 At least six Magothy species occur in the Turonian of Europe, while 

 several additional are represented in the two areas by closely related 

 forms, the additional facts upon which this conclusion is based being 

 found in the appended tables of distribution and in the chapter on Upper 

 Cretaceous floras of the world. 



The earliest Upper Cretaceous fauna in Maryland which affords any 

 adequate basis for correlation is the Mortoniceras fauna of the Matawan. 

 Although Mortoniceras is less restricted in its stratigraphic range in 



1 Berry, E. W., Jour. Geol., vol. xviii, 1910, pp. 252-258. 



2 E. g. in 1912, in The Coastal Plain of North Carolina, pp. 309-312. 



