COASTAL PLAIN CRETACEOUS DEPOSITS. 479 



Following the adjoiirninent of the evening session the Fellows of the 

 Society iissenibled for the annual informal dinner, which was served in 

 the geological laboratory. Professor B. K. Emerson acted as master of 

 ceremonies and extemporaneous speeches were made by several Fellows. 



Session of Saturday, December 29 



The Society convened in the geological laboratory at 10 o'clock a m, 

 the President in the cluiir. Announcement was made concerning rail- 

 road tickets, but no business was offered. 



The reading of scientific papers was resumed, and the following two 

 papers were read and discussed as a unit : 



CRETACEOUS DEPOSITS OF THE NORTHERN HALF OF THE ATLANTIC COASTAL 



PLAIN 



15V WILLIAM R. CLARK 



Contends 



Pago 



Historical review 479 



The formations 480 



Classifieation 480 



Distribution 480 



Knritan formation 480 



Mutawan formation 480 



Nave»inl< formation 48J 



Redbank formation 480 



Rancocas formation 480 



Manasquan formation 481 



Summary. 481 



Historical Review 



Daring the last few years consi(lcnil)le attention has boon devotefl to tlic Creta- 

 coouH <U'posits of the urea north of the Potomac river, in Maryland, Dclawaro and 

 New Jersey. The northern and southern i)ortions of this district have been, how- 

 ever, in the main independently investigiited, so that the relationships existing; 

 Ixjtween the two areas have not been very clearly indicated. Some recent work 

 by the writer and two of his students* shows that tlie strata of the entire re*rion 

 can be correlated, tiie main divisions hitherto established for the New Jersey series 

 continuing? to the southward across Delaware and Maryland. 



Until comparatively recently no satisfact«try dillerentiation had hcen made in 

 the Cretaceous strata of the southern portion of the district, althou^di the basal 

 clays and san<ls or Potomac formation were recognized by the older geologists, and 

 were fully described in 1888 1 by McGee. 



• Messrs D, E. Roberts and R. M. BaKj?, Jr. oonfliieted tiie inve.«tiKationH upon the "Ea.Mtern 

 )>liorc " of Marylan«l. 

 fTiiroo formatiouH of tiio middle Atlantie slope : Am. Jour. 9ci., 3d ser., vol. xxxv, pp. I2f,-li:j. 



I.XVm-Hri.i.. (itoL. 8of. Am.. Vol. 0. I8t»4. 



