PRHFACH 



The in'c'sciil voluiiic is the iii>l of ;i scries of reports dealing with 

 ilie sysleiuaUc g*-'ulugy of Maryland. These reports will appear i'roni 

 time to time as the several investigations arc completed, but not neces- 

 sarily ill geological secpicnce. By reference to \'(ikinie J (jf the Survey 

 it will be seen that the geological sequence of Maryland rocks is as 



follows: 



( I'lcistocene 

 Cenozoic -l Xeocene 

 I Eocene 



-, r . r Cretaceous 



Mesozoic { ^ ■ rn • 



1 J iirassic- 1 nassic 



r Permian-Carboniferous 



r^ -, . \ Devonian 

 Taleozoic < „., . 



bilnrian 



I Cambrian 

 Archean Algonkian-Archean 



Some of these divisions are more extensively developed in Maryland 

 than others so that the contemplated reports will differ greatly in size. 

 The oldest division, comprising the Algonkian-Archean, is entirely des- 

 titnte of organic remains in Maryland, while the Jnrassic-Triassic is 

 nearly so. The other seven divisions, however, contain either rich 

 faunas or floras; three of them, the Permian-Carboniferons, the Cre- 

 taceous and the Pleistocene containing both animal and plant fossils. 



These reports when completed will give both to the geologist and to 

 the general reader a comprehensive view of the past history of Maryland 

 territory from the earliest geological period to the present day.. For 

 educational purposes the volumes cannot fail to have much value, and 

 will find frequent use in the hands of those who are seeking to acquire 

 a knowledge of the physical and faunal history of the State of Maryland. 



The present volume on the Eocene deals with the earliest period of 

 the Cenozoic and, with the Xeocene, embraces what is frequently de- 



