REPORT OF THE STATE PALEiONTOLOGIST 1901 421 



still farther westward, that of the Naples fauna, which is an 

 invasion from the far northwest and occupies all the ground 

 from the meridian of Cayuga lake to the shores of Lake Erie. 

 Furthermore, the region occupied hj the invading Naples fauna 

 is clearly divisible into two subprovinces, that east of the Gene- 

 see river (Naples subprovince) into which the advance or herald 

 . species of the fauna penetrated, and the western (Chautauqua) 

 subprovince, or that beyond the Genesee river, from which the 

 advance species of the invasion had in notable measure departed 

 on their journey eastward, but which those following in their 

 train and pertaining to the same invading body had not passed. 

 No parallel illustration of the intrusion of so diverse organic 

 associations or faunas into an area so restricted as that here 

 concerned between the valley of the Delaware river and the 

 shores of Lake Erie is recorded so far as our present knowledge 

 goes. 



Study of waterlime strata and their fossil contents. During some 

 years past study has been made of the character and variation 

 in the succession of the waterlime series, which in our present 

 classification of the New York rock series is regarded as per- 

 taining to the geologic units termed Rondout and Manlius. The 

 field investigations in this work have been carried on largely by 

 D. D. Luther, and the results have been important in showing 

 the degree to which the strata vary in character from one 

 locality to another, but have been specially profitable in the 

 light which they have thrown on the nature of the peculiar 

 fauna inclosed by these sediments and in the new and interest- 

 ing contributions to paleontologic facts which they have 

 brought out. Several of the problems resulting from this series 

 of field investigations have yet to be carefully studied to be 

 appreciated in their full significance. Aside from the well 

 known crustaceans (Eurypterus, Pterygotus, etc.) of these 

 waterlimes which are produced in such remarkable perfection 

 and profusion at the cement quarries at Buffalo, and in certain 

 natural outcrops along the edge of the formation at Union 

 Springs, Cayuga co., and Jerusalem hill, Herkimer co., the asso- 



