1(- Xi:W YORK STATE MUSEUM 



I his iciiioii iinisi li(>\\(V(r he considered.^ These two examples 

 rciircsciii overlaps on I lie eastern shore of the central Helder- 

 ber«;:ian sea ( ( 'innherlaiid eliaiiiiel) .- 



Ill ilie iiorlliern region a i^'ood exani])le of o\-erlap is seen in 

 Ihe nelderber<»- ontlier of St Helen's island in ihe St Lawrence 

 river, o[>])osil(' Montreal." Ilerc^ a limestone w itii npper Helder- 

 bergian (Recraft-l*ort Kwenj fossils rests directly on the Utica 

 beds. The fanna of this limestone is in jiart suggestive of the 

 Oriskany, thus showing these beds to be very late Helderbergnau. 

 This overlap marks the neighborhood of the western shore of 

 the Helderberg sea in that region, Schuchert thinks that "' there 

 is no clear evidence that the Albany county, N. Y., area ever 

 connected with Montreal by way of the Champlain valley, as 

 was supposed by Logan and Dana to be the case.'' ^ No real 

 reason is known to nie why these areas need be considered dis- 

 tinct, Siince the Champlain region has been peneplained down to 

 the Champlainic, and any Helderbergian beds formerly existing 

 here would be removed by erosion. The similarity between the 

 St Plelen's Island, and New York Helderberg faunas suggests 

 a direct connection; the elements of difference between these 

 faunas indicate that the connection was by a narrow channel. 



The fauna of the Square^ lake limestone of Aroostook county, 

 ^fe.'' suggests a relationshij) with the np])er beds of the Helder- 

 bergian of the New York areas. However, several species un- 

 known in the New Y^ork LTelderberg are found here, and link 

 the fauna more closely with that of Oasjte. Whether the faunal 

 difference is such as to i-equire ])lacing this eastern fauna in a 

 separate basin, or whether the difference of the faunas is to be 



SS'rr Rios, N. Y. State Geol. l.^tli An Rep't, p. 427. I am inacbtcd to Mr 



('. A. II;irlii;i,i,M'l for tjillin.^: my nKciilioii to tliis .-ind the proccHlin.u: occurrence. 



- 'IMic IvciissclMcr jjcrit of eastern New York may re])i'esent tlie ovor- 

 hippinj; clastic niai'irin of tlie IleldeiiKM'u' roclcs resting on upturned and 

 eroded Canil)ric and Cliaiiiplaiiiic IxmIs. 



•■' Sclmclicrt. Am. (Icol. 1'.»01. UT:2ir.. 



* ^forc recently Professor Schnchert has expressed the l>elief in a channel 

 in the Connecticut valley region (Private letter). 



5,SV Hillings. Portland Soc. Nat. Hist. Proc. v. 1. 18G3; Williams, H. S. 

 U. S. Geol. Snr. l',ul. 105. 



