walcott.] PROBLEMS FOR INVESTIGATION. 381 



New Brunswick. — Through the efforts of Mr. G. F. Matthew many of 

 the problems relating to the Cambrian system in New Brunswick have 

 been successfully solved. More information is needed for — 



(!) The clearer identification of the Lower Cambrian or Olenellus 

 zone and its exact stratigraphic relations to the Paradoxides zone. 



(2) A clearer determination of the Upper Cambrian fauna and its re- 

 lations to the Paradoxides zone. 



(3) It is desirable that more data should be obtained upon the zo- 

 ologic relations of the different faunas to each other. 



Maine and Neic Hampshire. — The problem presented in Maine and 

 New Hampshire is essentially of the same character as that presented 

 in Nova Scotia. It is the determination of the presence of rocks of 

 Cambrian age by paleontologic evidence. Until this is done the other 

 problems of stratigraphic succession and geographic distribution of the 

 strata and faunas can not be considered. 



Eastern Massachusetts. — In eastern Mass achusetts it is desirable to 

 ascertain — 



(1) The stratigraphic relations of the strata carrying the Olenellus 

 fauna and Paradoxides fauna and decide whether the Upper Cambrian 

 is represented in the region. 



(2) To obtain more paleontologic data in order to correlate the vari- 

 ous outcrops that have been referred to the Lower and Middle Cambrian 

 in different portions of the Boston Basin and to the south-southwest 

 toward the Khode Island line. 



(3) To identify and map the Cambrian rocks in detail. 

 New York. — In New York it is desirable to ascertain — 



(1) The exact relation of the strata carrying the Olenellus fauna to 

 those carrying the Upper Cambrian or Potsdam fauna about the Adi- 

 rondacks. 



(2) The stratigraphic succession and thickness of the strata carrying 

 the Olenellus fauna in Rensselaer and Washington Counties, and 

 whether the Middle and Upper Cambrian can be recognized either by 

 the faunal or lithologic characters. 



(3) The geographic distribution of the Cambrian rocks in the Hud- 

 son Valley south of Rensselaer County. 



Adirondack subprovince. — The most important problem in connection 

 with this subprovince is the tracing of the transition from the sand- 

 stone of the Potsdam about the Adirondacks to the off-shore deposit 

 represented by the shales and slates now found beneath the limestone 

 f the marble belt of western Vermont and eastern New York. More 

 extensive collections of fossils are also desirable for the purpose of in- 

 stituting closer correlations between the faunal zones of the typical 

 Potsdam section of the Adirondacks with that of the correlated sand- 

 stone of the Mississippi Valley and elsewhere. 



Vermont. — In Vermont the problems presented for study in connec- 

 tion with the Cambrian rocks are somewhat of the same type as those 



